问题 填空题

为了安全起见,在探空气球中应充入的气体是______(写化学式).

答案

氢气密度小是最轻的气体,但氢气易爆炸,氦气密度也很小,但化学性质稳定,故用于充灌探空气球的是氦气气,氦气是由氦原子构成的,其化学式为:He;

故答案为:He

阅读理解

阅读理解。

     Whenever the sun dropped and the blue sky came up, my father and I used to climb the mountain

near my house. Walking together, my father and I used to have a lot of conversations through which

I learned lessons from his experiences. He always told me, "You should have goals like climbing the

mountain," Without the mountain-climbing that we both enjoyed, we couldn't have enough time to

spend together because my father was very busy, I really got a lot from mountain-climbing. It gave

me time to talk with my father and to be in deep thought as well as develop my patience (耐力).

     Once we climbed a very high mountain. It was so challenging for me because I was only ten years

old. During the first few hours of climbing, I enjoyed the flowers and trees, and the birds' singing, but

as time passed, I got a pain in both of my legs. I wanted to quit climbing. In fact, I hated it at that

moment, but my father said to me, "You can always see a beautiful sky at the top of the mountain, but

you can't see it before you reach the top. Only there at the top, can you see all of the nice things, just

like in life."

     At that time, I was too young to understand his words. But later after that, I got new hope and

confidence (信心). I found myself standing at the top of the sky, which was as clear as crystal

(水晶).

1. The passage tells us that mountain-climbing was _____ for the father and son. [ ]

A. hard

B. enjoyable

C. painful

D. comfortable

2. The word "quit" in the passage means "_____". [ ]

A. carry on

B. put off

C. give up

D. pick up

3. Which of the following is similar in meaning to the father's words in the second paragraph? [ ]

A. You will get all you need at the top of the mountain.

B. The sky is always as clear as crystal.

C. You can find life is full of nice things.

D. Never give up half-way.

4. We can infer (推断) from the last paragraph that _____.[ ]

A. the writer was very successful in his life

B. the writer didn't reach the top of the mountain

C. though the writer was young, he could understand his father

D. the writer used to stop half-way when he climbed the mountain

5. The best title for the passage is "_____".[ ]

A. Reaching the Top of the Mountain

B. Enjoy the Beautiful Views

C. Conversations Between Father and Son

D. Father and I

单项选择题