In April，thousands of holidaymakers rema...

“Things________never come again！” I couldn’t help talking to myself.

A．lost　　　         B．losing

C．to lose　　　     D．have lost

Every one of us must know：________we live can we save the earth.

A．by changing the way only

B．only by changing the way

C．by only changing the way

D．by changing only the way

—Can those________at the back of the classroom hear me?

—No problem.

A．seat　　　     B．sit

C．seated　　　      D．sat

A friend in need is a friend indeed. 是一句谚语。请根据自己的理解和经验，参考所给的汉语提示，以Ways of Making Friends为题写篇短文。词数 100 左右。

　　要求提示：１、每个人都需要朋友，如何交友极为重要。

　　２、要交朋友，首先对别人要友好。微笑是吸引别人的吸铁石（magnet）。

　　３、要使陌生人不管在何处，都能感到你的亲切。要关心别人胜过关心自己，不要以貌取人。

Global difference in intelligence is a sensitive topic, long filled with a large number of different opinions. But recent data has indeed shown cognitive (认知的) ability to be higher in some countries than in others. What's more, IQ scores have risen as nations develop --- a phenomenon known as the "Flynn effect". Many causes have been put forward for both the intelligence difference and the Flynn effect, including education, income, and even non-agricultural labor. Now, a new study from researchers at the University of New Mexico offers another interesting theory：intelligence may be linked to infectious-disease rates.

The brain, say author Christopher Eppig and his colleagues, is the "most costly organ in the human body". Brainpower consumes almost up to 90 percent of a newborn's energy. It's clear that if something affects energy intake while the brain is growing, the impact could be long and serious. And for vast parts of the globe, the biggest threat to a child's body -- and therefore brain ---is parasitic (由寄生虫引起的) infection. These illnesses threaten brain development __________. They can directly attack live tissue, which the body must then try every means to replace. They can invade the digestive pipe and block nutritional intake. They can rob the body's cells for their own reproduction. And then there's the energy channeled (输送) to the immune system to fight the infection.

Using data on national "disease burdens" (life years lost due to infectious diseases) and average intelligence scores, the authors found they are closely associated. The countries with the lowest average IQ scores have the highest disease burdens without exception. On the contrary, nations with low disease burdens top the IQ list.

If the study holds water, it could be revolutionary for our understanding of the still-confusing variation in national intelligence scores.

1.What is the main idea of the text? (no more than 10 words)

____________________________________________________________________

2.Complete the following statement with proper words. (no more than 4 words)

Those countries that have the_________ are always at the bottom of the IQ list.

3.Fill in the blank in Paragraph 2 with proper words. (no more than 5 words)

4.What can cause intelligence difference? (no more than 8 words)

5.What does the word "they" (Line 3, Paragraph 3) probably refer to? (no more

than 8 words.