One day, Allan and his friend Henry went swimming in a river. It was very hot. How happy they were in the river! After they got out of the water, they played games in the sun for a while.
On their way back, Henry saw some flowers. He liked flowers very much and ran into the green field to look at them. Now Allan was walking by himself.
Then he heard Henry calling out, "A snake（蛇）! Help!..."
"What's wrong with you?" asked Allan.
"A snake bit（咬）me in the leg. Come here!"
Allan ran over and saw a small red wound（伤口）on Henry' s leg.
"The snake was in the grass. I didn't see it."
"Sit down quickly"! Allan told Henry.
Allan put his mouth at the little red wound and began to suck（吸）at it. In this way he saved （挽救）Henry's life. "Oh, Allan, it's very kind of you to help me."
"That's all right. We are friends and we must always help each other."
小题1:It was________ when-Allan and Henry went out.
A．hot
B．cold
C．raining
D．wet小题2:After swimming, they played in the sun________.
A．the whole morning
B．for 2 hours
C．long
D．for a while小题3:On their way home,________ got something wrong with his____
A．Allan; leg
B．Allan; head
C．Henry; leg
D．Henry; head小题4:Henry and Allan are________.
A．workers
B．good friends
C．brothers
D．farmers小题5:Which of the following（下面的）is true?
A．Henry went to look at the flowers with Allan.
B．Allan saved Henry' s life.
C．Allan saw the snake.
D．They ran to the hospital at once.
。丁子香酚的一种同分异构体：对-甲基苯甲酸乙酯(F)是有机化工原料，用于合成药物的中间体。某校兴趣小组提出可以利用中学所学的简单有机物进行合成，A的产量标志着一个国家石油化工发展水平。其方案如下： 