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Scientists think they have answered a my...

Scientists think they have answered a mystery: How some ocean creatures got so huge so quickly.

A few million years ago, the largest whales, averaged about 15 feet long. Then seemingly overnight, one type of whale, the toothless baleen whale(须鲸类)became huge. Modern blue whales get as big as 100 feet. Nicholas Pyenson of the Smithsonian Natural History Museum said, “Why is that?” ”It happened in the glance of an evolutionary eye, which makes it harder to figure out what happened,” said Graham Slater, lead author of the study. Their study has suggested an answer: Ice ages in the last 3 to 5 million years started it, changing the oceans and food supply for whales.

The researchers used fossil records of the smaller whales to create a family tree for baleen whales which include blue whales, humpbacks and right whales. Using computer simulations(模拟)and knowledge about how evolution works, they concluded that when the size changes started, the poles got colder, ice expanded and the water circulation in the oceans changed and winds shifted,    Slater and Pyenson said cold water went deep and moved closer to the equator(赤道)and then eventually moved back up with small fish and other small animals that whales eat.

Baleen whale, which have no teeth, feed by eating huge amounts of fish they capture. Toothed whales, like sperm whales (抹香鲸), hunt individual fish, so the ocean chants that made food less evenly spread out didn’t affect them as much. But baleen whales hunt schools of fish.

Olivier Lambert at the Royal Belgian Institute of Natural Sciences calls it “a really convincing situation”. But he said the lack of fossils in certain time periods is an issue. As oceans warm from man-made climate change, the seas will be more like it was when the whales smaller and they will have a more difficult time surviving.

1.What does the author mean by “It happened in the glance of an evolutionary eye” in the second paragraph?

A. The change of baleen whales happened too quickly.

B. The change of baleen whales was too difficult to explore.

C. Researchers paid little attention to the change of baleen whales.

D. Researchers thought the change of baleen whales was unimportant.

2.What played the key role in baleen whales’ becoming huge?

A. Man-made climate change.

B. Its eating a huge amount of fish.

C. The water circulation in the oceans.

D. The increase of food supply for whales.

3.What do we know about sperm whales and blue whales according to the text?

A. Sperm whales eat more food.

B. Blue whaler live much longer.

C. Sperm whales prefer to hunt schools of fish.

D. Blue whales usually swallow schools of fish.

4.What can we infer from the last paragraph?

A. There are no whale fossils now.

B. The whales may become even bigger.

C. Global warming has threatened the whales.

D. Olivier Lamber thinks the study is perfect.


1.A 2.D 3.D 4.C 【解析】文章以鲸鱼为例分析了海洋动物生长变快变大的原因,提出了气候变化引起海洋变化,造成鲸鱼变小生存困难的现状,呼吁人们保护环境和动物。 1.A 句意猜测题。根据下句which makes it harder to figure out what happened可知划线句子指这种变化在进化的发展中只是匆匆一瞥,形容其速度之快。A...

A drug used to treat severe bleeding could save thousands of lives for mothers giving birth. A global trial of the drug found it reduced the risk of bleeding deaths during childbirth by nearly one-third. The study involved 20,000 women in 21 countries, mainly in Africa and Asia. The trial was carried out by London's School of Hygiene and Tropical Medicine. The drug is called d tranexamic acid (氨甲环酸). It is low-cost and researchers said it does not cause serious side effects for mothers or babies.

The drug is used to treat mothers for severe bleeding during childbirth, also known as postpartum hemorrhage (产后出血).It is the leading cause of mother’s death worldwide, according to the World Health Organization.

Haleema Shakur is the project director of the trial. She says despite medical advances in many countries, severe bleeding after childbirth remains a big problem in some parts of the world. “It's one of the biggest killers of mothers. In Africa and Asia. about 10 percent of women will end up with severe bleeding. " The drug works by stopping blood clots(血凝块) from breaking down after a mother gives birth. The treatment can prevent the need for doctors to perform surgery to find the source of bleeding.

Shakur said the best results were reported when the drug was given to women as soon as possible after childbirth, “The earlier you give it- so within the first three hours of giving birth—the better the effect is. ”

The next step will be to get the drug where it is needed provide training for doctors and nurses on how to use it. During the trial, women were given the drug in a hospital. But researchers are looking for easier ways to administer the drug so it can be more widely used in small clinics and rural areas.

1.Tranexamic acid is a drug that      .

A. should be used for every mother

B. helps mothers before giving birth

C. ensures most new-born babies’ health

D. can help mothers giving birth stop bleeding

2.What is the reachers’next plan?

A. To know how much the drug is.

B. To get permission to use the drug.

C. To let more people know the drug.

D. To make medical staff know how to use the drug.

3.What can we learn from the text?

A. The more mothers use the drug, the better its effect is.

B. African and Asian countries made great progress in medicine.

C. There is a long way to go before the drug can be used more widely.

D. Postpartum hemorrhage is the leading cause of women’s death.

4.What may be the best title for the text?

A. Care for the Health of Mothers

B. How Can We Use Tranexamic Acid Well?

C. Childbirth Drug Greatly Reduces Bleeding Deaths

D. What's the Biggest Killer of Mothers?



We have some friends who seem as if they understand and appreciate you, but really they might not. A girl named Nevaeh was about to find a friend that she thought understood her, but she actually didn't.

When Nevaeh was in kindergarten she didn't have friends. Every time she wanted to make some they would just walk away. That happened until she went to the third grade when a girl named Brooke said hello to her.

Nevaeh, a shy girl, didn’t answer. Since Nevaeh had no friends to talk to, her mouth would close up. After knowing Nevaeh was shy and needed friends, Brooke wouldn't leave Nevaeh s side and always talked to her. Nevaeh started talking more and was less shy. Once Brooke took her to her friends. There were only three girls, Karla, Mariana, and Isela, but Nevaeh was fine with it. At least she had friends.

They got along very well and had a few things in common. When they were finally in middle school, Brooke and Nevaeh became best friends, but as they got older, they changed. When Nevaeh changed the way she looked and acted, Brooke didn't like it. Brooke startled to judge her, and make her wear stuff that she didnt like. They had arguments about the wav Nevaeh wanted to look, and how Brooke didn't like what she wore.

Nevaeh wasn’t sure if she could really trust Brooke anymore. That was until she met Susan who understood Nevaeh and didn’t judge her by her looks, but had the same interests as Nevaeh. They liked to dress in the same kinds of things and had similar hobbies.

Nevaeh really liked Susan because she never judged her. When they were talking about their interests it was like they had known each other for a long lime.

Nevaeh was still friends with the other girls, and was happy that she finally had someone that understood her and appreciated her.

1.What does the underlined word "she” in the first paragraph refer to?

A. Susan.    B. Karla.

C. Brooke.    D. Nevaeh.

2.Why did Nevaeh have no friends in kindergarten?

A. She didn't want friends    B. She wasn’t accepted by others.

3.How did Nevaeh react to Brooke's judgment on her?

A. She rejected it.    B. She tolerated it.

C. She corrected it.    D. She appreciated it.

4.What was Susan like according to the text?

A. Brave and helpful.    B. Smart and humorous.

C. Sincere and supportive.    D. Clever and hard-working.



Top Summer Music Festivals to Travel to

Summer is the best time of a year for music lovers, especially if you love the outdoor concert scene. Festival season is just kicking off, and there is a lot to look forward to in the upcoming months.

Primavera Sound

To kick off the summer, there's no better place than Barcelona. On the concert lineup, you'll find bands like The Zombies, Arcade Fire, and Bon Iver. Then take some time to taste the local food and wine.

May 31-June 4; Barcelona, Spain

Music Type: Rock, hip-hop

Price: $86—$323

Governors Ball

One of the great summer concerts in New York City is Governor's Ball, which takes place in early June at Randall’s Island Park. Some of the playing artists include Tool, Phoenix, Lorde, Flume, and the Wu-Tang Clan.

June 2-4; New York City, New York, USA

Music Type: Rock, hip-hop, pop

Price: $105—$405


Bonnaroo is another summer event that draws in crowds of around 60,000 each year. Some of the most well-known musicians will be playing this year, including U2, Red Hot Chili Peppers, The Weeknd, and Chance the Rapper.

June 8-11; Manchester, Tennessee, USA

Music Type: Rock, hip-hop

Price: $210-$554

Firefly Music Festival

Many people haven't thought of going to Delaware for a summer vacation, hut mid-June is a great time to plan this trip if you love music. Headliners for this year’s slow are The Weeknd, Muse, Twenty One Pilots, Chance the Rapper, and Bob Dylan.

June 15-18; Dover, Delaware, USA

Music Type: Blues, rock

Price: $179-$499

1.Which concert has the cheapest ticket?

A. Bonnaroo.    B. Governors Ball.

C. Primavera Sound.    D. Firefly Music Festival.

2.What is special about Firefly Music Festival?

A. It performs Blues.    B. It is popular with travelers.

C. It is held in summer.    D. It has many famous musicians.

3.When can you enjoy Flume's performance?

A. On May 31.    B. On June 3.

C. On June 9.    D. On June 15.










Recently our class had a heated discussion about the Winter Morning Jogging Activity in our school._______
















Dear Alice,

I was delighted to receive your letter.Thank you on the English dictionary you bought it for me.I receive it this morning.There is no doubt which it is of great help to me.I’m deep grateful for your advice that I should pay more attentions to practicing my spoken English.I’ve made up my mind to speak English both in and out of class.Next month,I’ll make trip to Australia,which is organizing by my school.I hope I can practice my spoken English there as many as possible.By the way,I am sending you a set of stamps with this letter,but I'll send you more if I get any.I do hope you will have a good holiday.



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