分四人一组，以“What's cool to teenagers？”为主题，选出四件同学们认为最酷的事。四全小组成员分别就一项展开调查。统计全班支持该项的人数及相应的百分比，并请他们说明支持原因。完成调查后，根据所得信息，小组成员共同分析该调查显示出的问题及其对中学生的各种影响，最后整理出一份调查报告。

注：答卷完成后，根据解题表现，经过讨论做出对小组成员表现的评价，填入下表评价栏目内，得分栏目由老师填写。

小组成员、分工、评价表：

Grades（分数，得分） at school are often a top worry for children. If you worry most about grades, ask yourself these questions:
●  Why are grades important? What do grades mean to me?
●  How do I get ready for class? Do I go over my notes even when there isn't a test?
●  Do I have a good place to do my homework?
●  Have I tried different ways of studying?
If your worry is about a fight you had with your friend, you might write down all the things you could do----write a note to him or her, invite him or her to watch a basketball game, say sorry to him or her and so on. Once you have a list of things you could do, you can choose one thing that could get your friend back.
You can ask for help when you're worried. You can find someone to talk to, such as your parents, friends, and teachers.

1. 1.

   What do children often worry most about?

   1. A.
      Their hobbies.
   2. B.
      Their homework.
   3. C.
      Their grades at school.
   4. D.
      A fight with their friends.
2. 2.

   According to the passage, when you're worried, you'd better _______.

   1. A.
      work hard
   2. B.
      ask for help and talk to someone
   3. C.
      get ready for class
   4. D.
      do your homework
3. 3.

   If you're worried about grades, DON'T ask yourself "_______".

   1. A.
      Why are grades important?
   2. B.
      What do grades mean to me?
   3. C.
      How do I get ready for class?
   4. D.
      Why not give up（放弃） my studies?
4. 4.

   If you had a fight with a friend, you could _______.

   1. A.
      invite him or her to watch a game
   2. B.
      put the blame（责备）on him or her
   3. C.
      try to make new friends
   4. D.
      leave him or her alone
5. 5.

   What does the passage mainly tell us?

   1. A.
      Who is often worried.
   2. B.
      When people are worried.
   3. C.
      How to deal with worries.
   4. D.
      What kinds of worries people have.

减数分裂时，等位基因的DNA片段的交换和重组通常发生在：

1. A.
   偶线期
2. B.
   粗线期
3. C.
   双线期
4. D.
   终变期