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某工程双代号网络计划如图7-1所示，其中关键线路共有()条。

A. 1
B. 2
C. 3
D. 4

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We learn from the text that raccoons______.

A. only come out at night
B. often visit people's houses
C. like to find food in rubbish cans
D. like to live with people in winter

In northern areas, the raccoon's activity drops off considerably during the winter, but he does not actually totally rest.
The raccoon family is usually made up of a mother and her young. After mom bears babies, she becomes teacher, protector, and provider of food. At first she nurses her babies; later she goes in search of solid food to bring back to her young.
Raccoons are born in the spring and are fed with mother's milk until late summer. Mother shows her children how to climb a tree quickly to escape enemies, how to swim, and how to catch mice and other small animals.
Raccoons are famous for their nighttime search in trash cans (垃圾桶). They can find a home almost anywhere.
One special thing about the raccoon is that______.

A. it can climb trees
B. it is active at night
C. it washes the food it eats
D. it has a sharp sense of smell

Depression, whether in grown-ups or children, is poorly understood. Some children are more at risk, such as those who are ill or who come from a broken family. But there are also many simpler worries, such as exam fears. It's not always easy to notice depression in children, partly because they are not so able as adults to express their feelings and partly because they are more likely to act out their feelings with bodily actions. So while some children are clearly sad, quiet, and tearful, others may become troublesome, hurting or fighting with others.
If you are worried about your child, you should talk to your doctor and to your children's friends, too, to try to learn about their feelings. Medicine may be used, although less often than they are in grown-ups. But it's very important that efforts are also made to help children understand why they became depressed, how they can deal with the problems in their life, and how they can form. a more positive (正面的) opinion of their world. Support within the family can help problem solving (解决).
What was believed about children's life in the past？

A. It was full of happiness.
B. It was hard to control.
C. It was marked with depression.
D. It had few health problems.

What does the underlined word "This" (line 6, para. 1) refer to？

A. Travelling in the smoking compartment.
B. Making sure that the train was on time.
C. Buying two new tickets.
D. The whole situation.