以下哪一项不属于选择关键字的策略（） A.不断地寻找关键字 B.使用更长的关键字 C

阅读理解.

      Experts (专家) say that students usually need eight to ten hours' sleep at night, but more Chinese

 students do not get enough sleep. Some Chinese parents are usually glad to see their children studying

 late. They will think their children work very hard.  But not all parents are happy about this. Once a

 mother told us that every morning her 10-year-old boy put up one finger with his eyes still closed;

 begging (祈求) for one more minute to sleep. Like thousands of students "early birds" in China, he has

 to get up before six every morning.

      A report shows that a good night's sleep, students seem to be weaker than they should be. Many

 students have fallen asleep during class at one time or another. Too much homework is not the only

 reason why students stay up late .  Some watch TV or play the computer games late into the night.

      Experts have ever said that students should develop good study habits. So some clever students

 never study late, they are able to work'well in class.

1. The l0-year-old boy begged for one more minute to sleep because _____.

A. he didn't have enough sleep

B. it wasn't time for him to get up

C. he didn't want to go to school

D. he wanted his mother to wake him up

2. In this passage "early birds" means persons who _____.

A. get up early

B. get up late

C. sleep less

D. don't want to sleep

3. From the passage we know if students don't get enough sleep, they may _____.

A. become too weak to sleep

B. not work well in class

C. go to bed early

D. be weak in English

4. "Stay up late" here means _____.

A. study late

B. watch TV late

C. not go to bed until late

D. stay outside

5. According to the passage, which of the following is right?

A. If you want to study better, you must work hard.

B. Sleeping less means working hard.

C. Some clever students can work well in class because they have good study habits.

D. Students don't have enough sleep only because they have a lot of homework to do.

循环气中的氩气浓度的下降，转化率会（）。

A、上升

B、下降

C、不变

D、先上升后下降

苏东坡《赤壁赋》中写道：“盖将自其变者而观之，则天地曾不能以一瞬；自其不变者而观之，则物与我皆无尽也。”下列说法中与苏东坡观点相近的是 [ ]

A．静者静动，非不动也。静即含动，动不舍静  

B．人一次也不能踏进同一条河流  

C．日方中方睨，物方生方死  

D．事物的状态不过是我们的心灵所采取的一种观点

灭火机包括哪些？

鼻咽癌颅底骨质破坏，海绵窦受侵时最易影响的一支颅神经是（）。

A.外展神经

B.三叉神经

C.滑车神经

D.动眼神经

E.视神经