下图为一种分子的结构示意图，试据图回答下列问题：图中①表示（），⑨表示（）。图中有（

看图，完成句子。

用declare与announce的适当形式填空。

1. The judges _____ the contest a tie.

2. The officials _____ new rules to cover the championship bout.

3. It was about 3 years since the president _____ war, and now the two countries are still on war.

阅读理解。

     Last Friday my brother and I were driving home together after doing some shopping and gave our

attention to an interesting conversation. Because of this distraction (分心)my brother took a wrong turn.

Unfortunately, the wrong turn took us towards a bridge and we had no way to turn back. Unwillingly, my

brother paid the bridge fee and drove on. He was clearly frustrated by the mistake and the needless

waste of $4.

     We eventually reached an exit and, as we took it, my brother noticed a young fellow pulled over to

the side of the road. He came out of his car and tried to phone someone. I was busy trying to figure out

which way we would go next but my brother pulled over and asked the guy if he needed any help. And

he did. He had a flat tire and needed a tool to get it off.

     My brother gave him a wrench, and then began to help him change the flat. The young man said that

this had been a bad week for him: earlier he had gotten into a minor car accident, and now this flat on his

way home from work. But he called us "a breath of fresh air" and kept thanking us because he really

would have been stuck if we hadn't come along.

     After we finished the job he thanked us again and pulled out $20 from his pocket and tried to give it

to us. "No," I said. "We were never supposed to even get on that bridge, we took a wrong turn. But now we know why we did. It was to help you. Thank you for turning our mistake into an opportunity to

serve."

     What I loved most was that my brother was able to see a chance to help. His reaction in the situation

is a lesson for everyone and we felt so good the rest of the day.

1. When did the author and his brother notice the young man who had a flat tire?

A. Before they arrived at a bridge.

B. When they were passing through an exit.

C. When the young man stopped them for help.

D. After they came back to the right road.

2.We can learn from the text that the writer's brother ______.

A. didn't know the roads well

B. was a warm-hearted young man

C. made the turn to help the young man

D. regretted making a wrong turn all the way home

3.What did the young man mean by calling the writer and his brother "a breath of fresh air" ?

A. He had been in the hot sun waiting for help for so long.

B. His car's air conditioner was broken.

C. They calmed him down by offering him a cold drink.

D. They changed his bad luck and the bad mood he was in.

4. Which of the following sentences best describes the writer's experience? 

A. It's no use crying over spilt milk.

B. God helps those who help themselves.

C. Nothing in the world is difficult for one who sets his mind to it.

D. If you light a lamp for somebody, it will also brighten your path.

硫化丙烯（化学式为C₃H₆S）是大蒜中的一种成分。下列关于硫化丙烯的说法中错误的是（   ）

A．硫化丙烯属于有机物

B．硫化丙烯由碳、氢、硫三种元素组成

C．硫化丙烯中碳元素的质量分数为30%

D．1个硫化丙烯分子由3个碳原子、6个氢原子和1个硫原子构成

随时随地为别人着想，成了王冬的习惯。今年8月，王冬因患慢性阑尾炎，去南京检查治疗，刚下火车就遇上南京市爱心协会组织的义务劳动。他不顾身体虚弱，也上前参加了劳动。他就是这样不顾自己，只为别人着想。
最能准确复述这段话主要意思的是( )。

A．王冬一心只为别人，从不为自己着想
B．王冬身体并不好，今年8月他还去南京治病
C．王冬养成了随时随地为别人着想的习惯，连去南京治病时都不顾身体虚弱参加劳动
D．王冬是在身体不佳的情况下主动参加义务劳动的