阅读短文，根据要求完成下面各小题

In the teen years, people change in many ways. （A） The body changes and so do thoughts and feelings. These changes become an important part of teenage life.

      Teens may often harm their health by developing bad lifestyles. Bad eating habits and less sleep may cause lots of problems. For example, they may often feel tired and have no interest in anything.

Teens' feelings usually change, too. They may get angry more easily. Other changes include becoming depressed more easily and feeling nervous. Some teens may start to keep to themselves, and then always show their anger and dislike for another person or group.

      During the teen years, people will usually have some problems that may cause other problems. One reason for this may be that teens are never taught about the changes that are taking place．（B）他们不知道该如何处理这些问题．Teachers and parents should spend time with young teens and teach them about the changes．Most of the time，it's good for teens to know about them．

1．请将（A）句译成汉语。

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2．How may teens often feel according to the passage?

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3．Who may get angry more easily，teens or adults?

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4．请将（B）句译成英语。

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5．What does “them” in the last sentence refer to（指）?

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你知道机器人身上有多少不同的部分吗?