铬酸钾法测定氯化钠的含量A．铬酸钾指示液B．硫酸铁铵指示液C．荧光黄指示液D．铬黑T

阅读理解。

       It was a fine morning. At 7:30,Carlos went to his friend's home. He knocked al the door. "Hey,Bob! Come on!"he called,Carlos waited for three minutes. Then he knocked at the door again. At last the door opened. Bob came out. It seemed that he was sleeping. He was putting his coat on and getting some books.

     "Wake up,Bob!" said Carlos,"What's the matter with you?"

      Bob opened one eye. "Well, I watched TV last night. It was very late,but it was very good film. It was about spies. I like it very much."

       "Come on!"Carlos said,"Now we are late for school. "Carlos pushed open the door and they went to school.

    "Hey,look at that!"said Carlos. 

     Bob turned and looked."Oh,wow!"said Bob.

     A wounded(受伤的)man was coming to them. Bob and Carlos saw some blood(血)on that man's coat and trousers. The man stopped when he saw the boys.

     "Help!"he said,"Help me!"

     Carlos took Bob's arm. "We had better get out of here. That man looks like trouble!"

     The boys wanted to run away. But the wounded man ran to the boys when a black car was coming.

1. Carlos and Bob were _______ .

A. policemen

B. workers

C. teachers

D. students

2. Carlos knocked at Bob's door, and Bob _______ .

A. got up at once    

B. didn't get up all the time

C. didn't get up until three minutes later    

D. went to bed again

3. Bob liked the film on TV very much because it was about ______ .

A. doctors

B. spies

C. a wounded man

D. policemen

4. "The man looks trouble!"here means _________ .

A. he doesn't look well

B. he needs some help

C. he may be a bad man

D. he wants to help us

5. The black car ________ .

A. saw Bob and Carlos

B. found some blood on the man's coat and trousers

C. ran to the boys

D. was running after the man

5÷8=______（小数）=______（百分数）=10：______=______：24．

车辆运货时应达到的安全措施条件有（）。

A.不能超载

B.货物堆放均匀、牢固

C.装货后的高度离地面不得超过5米

D.高出车身的货物应加以固定 

E.车上货物伸出车箱前后的总长不能超过3米

下列对脾肾韧带的描述，不正确的是()

A．内含脾动脉

B．内含脾静脉

C．是自脾门至左肾前面的双层腹膜结构

D．是自脾门至右肾前面的双层腹膜结构

E．内含胰尾

当光线由光密媒质射向光疏媒质时，其折射角将比入射角（）