你可以用 “___________!” 来表示惊讶。

   A. Goodbye             B. My god               C. See you

根据下面一篇短文的内容判断下列句子的正误，正确的用“A”来表示，错误的用“B”来表示。

A young man couldn’t sleep well every night. He was very worried. One day he went to see the doctor. The doctor looked him over carefully. But nothing was wrong with him. The doctor told him to count from 1 to 10 again and again. “Keep doing it until you fall asleep,” the doctor said.

After a few days, the young man came to the doctor again. But to his surprise, the doctor found the young man was even worse than before! “Didn’t you count as I told you?” the doctor asked. “Yes, I did,” the young man answered.   “But every time when I reached eight, I couldn’t help jumping(跳) from bed.”

“But why?” the doctor wanted to know. The young man said, “I am a boxer.”(拳击运动员)

1.The young man had a very terrible illness(疾病).

2.The doctor told him to count numbers from 1 to 1000 .

3.After a few days the young man was even worse.

4.The young man didn’t do the things that the doctor told him.

5.The young man was a boxer.

 

在物理学中，磁场的强弱用磁感应强度（用字母B表示，国际单位是特斯拉，符号是T）来表示，磁感线越密的地方，磁场越强，磁感应强度B越大.

（1）在图20中，甲为某磁极附近磁感线的方向和分布的示意图，由图可知，该磁极为 ▲ 极，若在l处放置一个小磁针，当小磁针静止时，其指向应是图乙中的  ▲   .
（2）磁敏电阻阻值的大小随磁场的强弱变化而变，图丁是某磁敏电阻R的阻值随磁感应强度B变化的图象，据图线可知，磁敏电阻的阻值随磁感应强度B的增大而▲ ．图线没有过坐标原点，说明  ▲  .
（3）王强设计了一个可以测量该磁敏电阻R的电路如图丙所示，（其中磁敏电阻所处的磁场未画出）．将该磁敏电阻R放置在磁场中的位置某处，测出电阻后，利用R—B特性曲线可以读出相应的磁感应强度.
①在图甲磁场中1处，测得的数据如图20表中所示，则该磁敏电阻的测量值为 ▲ Ω. 
②根据该磁敏电阻的R-B特性曲线可知，1处的磁感应强度为   ▲    T.
③在实验过程中，仅将磁敏电阻从1处移至2处，其它条件不变，那么电流表的示数
▲   （填“增大”、“减小”或“不变”）.
④依据上述方法获得的磁感应强度B的测量值与该点实际值存在不小的误差，为尽可能准确反映空间某点磁场的强弱，你认为在选择磁敏电阻时应注意什么问题？

根据下面一篇短文的内容判断下列句子的正误，正确的用“A”来表示，错误的用“B”来表示。
A young man couldn’t sleep well every night. He was very worried. One day he went to see the doctor. The doctor looked him over carefully. But nothing was wrong with him. The doctor told him to count from 1 to 10 again and again. “Keep doing it until you fall asleep,” the doctor said.
After a few days, the young man came to the doctor again. But to his surprise, the doctor found the young man was even worse than before! “Didn’t you count as I told you?” the doctor asked. “Yes, I did,” the young man answered.   “But every time when I reached eight, I couldn’t help jumping(跳) from bed.”
“But why?” the doctor wanted to know. The young man said, “I am a boxer.”(拳击运动员)
【小题1】The young man had a very terrible illness(疾病).
【小题2】The doctor told him to count numbers from 1 to 1000 .
【小题3】After a few days the young man was even worse.
【小题4】The young man didn’t do the things that the doctor told him.
【小题5】The young man was a boxer.

“辛烷值”用来表示汽油的质量，汽油中异辛烷的爆震程度最小，将其辛烷值标定为100，如图是异辛烷的球棍模型，则异辛烷的系统命名为（    ）

A．1,1,3,3-四甲基丁烷	B．2,3,4-三甲基戊烷
C．2,4,4-三甲基戊烷	D．2,2,4-三甲基戊烷