问题 选择题
给出以下两个定理:
①线段垂直平分线上的点到这条线段两个端点的距离相等;
②到一条线段两个端点距离相等的点,在这条线段的垂直平分线上。
应用上述定理进行如下推理,
如图,直线l是线段MN的垂直平分线。
∵点A在直线l
∴AM=AN( )
∵BM=BN
∴点B在直线l上( )
∵CM≠CN
∴点C不在直线l上( )
如果点C在直线l上,那么CM=CN( )
这与条件CM≠CN矛盾
以上推理中各括号内应注明的理由依次是(   )


A.②①①①
B.②①①②
C.①②①②
D.①②②①
答案

答案:D

阅读理解

阅读下面的短文,并做每篇后面的题目。从四个选项中选出能回答所提问题或完成所给句子的最佳答案。                                

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.

填空题