1 . 如果你经常不吃早餐，你就很难在课堂上集中注意力。(trouble)
If you often skip breakfast, you will ________________in class.

2 . ______________________ , you should examine yourself and see if there is something wrong with your personality.
作为一个青少年，你应该全神贯注于学习。(concentrate)

7 . 英汉互译
1. skip _______________________
2. immediately _______________________
3. *faint _______________________
4. yogurt _______________________
5. pass out _______________________
6. concentrate _______________________
7. slim down _______________________
8. extreme _______________________
9. _______________________ vi. 变苗条，减肥；adj. 苗条的；微薄的，小的
10. _______________________n. 效果，作用；影响

8 . I don’t see how any creature can ______ under those conditions.

A．survive

B．exchange

C．concentrate

D．seek

9 . 汉译英
1. ________ vt. & n.伤害，损害→ ________ adj. 有害的→ ________ adj.无害的；无恶意的
2. ________ n.论点；论据→ ________ adj.好辩的；争辩的→ ________ vi. & vt.争论；辩论；说服→ ________ n.争辩者；辩论者
3. ________ vt.取代；接替→ ________ n.更换；代替者→ ________ adj.可替换的；可置换的；可放在原处的
4. ________ vi.专注，专心；集中注意力→ ________ adj.集中的；全神贯注的→ ________ n.集中；浓缩；集合
5. ________ adj.关切的；关心的→ ________ n.关切；关心 v.与……有关；关于
6. ________ adj.有益的；有意义的→ ________ n. 报酬；报答；酬谢 vt.奖励；奖赏
7. ________ n.增添；添加→ ________ adj.附加的，额外的→ ________ vi. & vt.加起来；做加法；增加
8. ________ adj.局限的，限制性的→ ________ adj.有限的；有限责任的（公司） ________ adj.无限的→ ________ n.限制；限度；界限 vt.限制；限定