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For thousands of years comets have been ...

For thousands of years comets have been a mystery to man. They travel across the sky very fast and have a bright “tail” of burning gas. The comet Tempel 1 has an orbit far outside the orbit of the furthest planet in our solar system, Pluto. It has been there for 4.6 billion years, 133 million kilometers from Earth.Once a little American spacecraft crashed into Tempel 1. The spacecraft had a camera and it took a photograph of the comet every minute before it finally crashed into its surface.

The space mission to Tempel 1 cost $335 million and was called Deep Impact. The spacecraft was traveling at 37,000 kilometers per hour when it hit the comet and the crash completely destroyed the spacecraft. But before it hit the comet, the spacecraft took some amazing photographs. The last one was a close­up picture which the spacecraft took just 3 seconds before it crashed into the comet.

“Right now we have lost one spacecraft,” said a delighted NASA engineer. Deep Impact was like an American Independence Day fireworks display. It took many years to plan and ended in an enormous explosion.

The spacecraft which crashed into the comet was made of copper and was the size of a washing machine. It was dropped from a mothership into the path of the comet and the mothership then photographed the cloud of ice, dust and organic chemicals that rose from the surface of the comet after the crash.

The crash completely destroyed the spacecraft but nothing really happened to the comet: experts believe that the crash slowed the comet down by no more than 1/10,000 of a millimeter a second. The aim of the mission was to study for the first time the interior of a comet.

The mothership was 480 km from the explosion and observed the crash and the explosion with instruments for 800 seconds. Seven satellites, including the Hubble space telescope, watched the moment of drama, and over the next day and night about 50 telescopes on Earth were watching the distant comet.

1.How many hours did it take for the spacecraft from the earth to touch the comet Tempel 1?

A. About 2,500.    B. About 3,500.

C. About 4,500.    D. About 5,500.

2.Which of the following shows the possible orbits and positions of the comet Tempel 1?

S=Solar     P=Pluto

T=Tempel 1

A.     B.

C.     D.

3.Which of the following is the closest in meaning to the underlined word in Paragraph 5?

A. Position.    B. Relation.

C. Inside.    D. Distance.

4.The author’s main purpose in writing the passage is to________.

A. inform people the discovery of a new comet

B. show the power of America in space

C. introduce the knowledge of comets

D. introduce an experiment

 

1.B 2.C 3.C 4.D 【解析】 本文是一篇科普说明文,主要介绍了一次人类用飞船撞击彗星的实验,使用卫星对撞击的情况进行拍摄,以研究彗星的更多信息。 1.细节理解题。根据第一段第四句It has been there for 4.6 billion years, 133 million kilometers from Earth.可知Tempel 1离地球133million公里;根据第二段第二句The spacecraft was traveling at 37,000 kilometers per hour可知宇宙飞船的速度是37000公里每小时。所以大约要飞行3500小时。故B项正确。 2.推理判断题。根据第一段第三句The comet Tempel 1 has an orbit far outside the orbit of the furthest planet in our solar system, Pluto.可知Tempel 1的轨道位于冥王星的外面,而冥王星是太阳系的恒星之一。故C图是正确的图示。 3.猜测词意题。根据本句The aim of the mission was to study for the first time the interior of a comet.可知这次使命的目标是通过飞行器撞击彗星,来研究彗星的内部构造。故划线词意为inside。故C项正确。 4.主旨大意题。本文主要介绍了一次人类使用飞船撞击彗星的实验,使用卫星对撞击的情况进行拍摄,以研究彗星的更多信息。故D项正确。
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Here are some kids who had great ideas that they turned into inventions. We call these kids “brain children”.

Six­year­old Suzanna Goodin, tired of cleaning the cat food spoon, came up with the idea of a spoon­shaped cracker that can be eaten. She won a grand prize for her invention in the Weekly Reader National Invention Contest.

Eight­year­old Theresa Thompson and her 9­year­old sister Mary were the youngest sisters to receive a US patent. They invented a solar tent for a science fair project in 1960. They called the device a Wigwarm.

At age 9, Margaret Knight began working in a cotton mill, where she saw a steel­tipped shuttle (梭子) fly out and hit a nearby worker. As a result, Margaret made her first invention: a shuttle restraining device. She went on to invent the machine that makes the square­bottom paper bags we still use for shopping today. That machine was patented in 1871.

Eleven­year­old Jeanie Low received a patent on March  10, 1992, for inventing the Kiddie Stool(凳子) — a fold­up stool that fits under the sink so kids can unfold it, stand on it, and reach the sink on their own!

Becky Schroeder began her patenting career when she was 14 years old. She put phosphorescent_paint on paper under her writing paper so that she could write in the dark. This invention was later used in all sorts of ways. Doctors use it in hospitals to read patients’ charts at night without waking them, and astronauts use it when their electrical systems are turned down for recharging.

Fourteen­year­old Pamela Sica invented a push­button device that raises the floor of a car so that goods can be raised and easily removed. Her invention won a grand prize for her age group in the Weekly Reader National Invention Contest. She wanted to patent her invention but found that it was too expensive.

Eight­year­old Chelsea Lannon received a patent in 1994 for the “pocket diaper (尿布)”, a diaper that has a pocket that holds things. She got her idea while helping her mother with her baby brother — while she was still in kindergarten!

1.Which inventions won a prize in the Weekly Reader National Invention Contest?

A. The spoon­shaped cracker and the shuttle restraining device.

B. The shuttle restraining device and the Kiddie Stool.

C. The Kiddie Stool and the pocket diaper.

D. The spoon­shaped cracker and the device that raises the floor of a car.

2.What can we know from the passage?

A. Theresa Thompson was the youngest child to make an invention.

B. A Wigwarm can be used to make paper bags.

C. Margaret Knight made more than one invention.

D. Jeanie Low invented the spoon­shaped cracker that can be eaten.

3.According to Paragraph 6, “phosphorescent paint” probably refers to a kind of paint that________.

A. can produce light in the dark

B. is used to write things

C. is produced in the dark

D. is specially designed for doctors

4.The idea of the pocket diaper occurred to Chelsea Lannon when she________.

A. was cleaning the cat food spoon

B. was in primary school

C. was helping her mother

D. was working in a cotton mill

 

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3. 可以适当增加细节,以使行文连贯。

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16.A. although    B. because    C. unless    D. when

17.A. famous    B. free    C. rich    D. popular

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