题目内容：

 

1.People from north and south China have different habits. Do you know why? The answer is in their genes (基因) according to USA Today. More people from north China have a Special gene. It helps them digest (消化) meat and fat. Few people in the south have this gene.The gene helps people live more easily in the north. There is more meat and fewer vegetables there.

2. Global warming is causing many problems. It is making insects (昆虫) eat more crops(庄稼), The Atlantic reported. Insects' body temperatures change with their environment. On warm days, their body temperature becomes higher than usual. So their metabolism(新陈代谢)becomes faster This means they need to eat more.They also breed (紧殖) more quickly on hot days.

3. Are babies carefree (无忧无虑) ? You might think so. But actually, 2-year- old babies care about what others think about them, according to a US study. Scientists used to think that this only happens in 4-year-old children. But a new study shows that the age is earlier. And 2-year-old children can change their behavior to get a more active response(反应)from others.

4. Mmm..chocolate smells So good. But do you know where chocolate comes from? Chocolate is made from cacao(可可豆). Scientists used to think cacao was first found in Central America and Mexico about 3,900 years ago. But a new study said it is not true, Scientists from Canada have found that people in Ecuador( 厄瓜多尔) grew cacao. They grew the plant over 5,000years ago.

 

 

1.What's the topic of passage one?

A.Different genes, different habits B.Hot and hungry insects. C.Where chocolate comes from.

2.What can we conclude from passage two?

A.Insects' body temperatures always stay the same, never unchanged.

B.On hot days, insects' metabolism becomes more slowly that usual.

C.Global warming can make insects eat more and breed more quickly.

3.Which of the following is true according to passage three?

A.No babies care about what others think about them.

B.Two-year-old babies care about what others think about them.

C.Only four-year-old babies care about what others think them.

4.What does the fourth passage tell us?

A.Chocolate smells so good.

B.Cacao was first found about 3,900 years ago.

C.A new study shows when and where people grew cacao.

5.What's the best title for all the four passages?

A.Babies Also Care. B.Unbelievable Facts. C.New Scientific Discoveries.