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节日里，人们常常用放气球的形式庆祝。思考完成以下问题。

如果用相同的氢气球在不同的纬度进行施放，上升最快的地区是（）

A.赤道地区

B.副极地地区

C.副热带地区

D.极地地区

答案

参考答案：A

解析：纬度越高，对流越旺盛，气球上升越快，故A正确。

填空题

When I was growing up, I was embarrassed to be seen with my father. He (1) severely crippled and very short, and when we would walk together, his hand on my arm (2) balance, people would stare. I would inwardly be afraid (3) squirm at the unwanted attention. If he ever noticed or was bothered, he never let (4) .
It was difficult to coordinate (5) steps - his halting, mine impatient - and because of that, we didn’t say much as we went along. But as we started out, he always said, "You (6) the pace. I will try to adjust to you. "
Our usual walk was to or (7) the subway, which was how he got to (8) . He went to work sick, and (9) nasty weather. He almost never missed a day, and would (10) it to the office even if (11) could not: a matter of pride!
He never talked about himself as an object of pity, (12) did he show any envy of the more fortunate or able. What he looked for in others was a "good heart", and if he found one, the owner was good enough for him.
Now that I am older, I believe that is a proper standard (13) which to judge people, even though I still don’t know precisely (14) a "good heart" is. But I know the times I don’t have one myself.
He has (15) gone many years now, but I think (16) him often. I wonder if he sensed my reluctance to be seen with him during our (17) . If he did, I am (18) I never told him how sorry I was, how unworthy I was, how I regretted it. I think of him when I complain about trifles, when I am (19) of another’s good fortune, when I don’t have a "good heart".
At such times I put my hand on his arm to regain my (20) , and say, "You set the pace, I will try to adjust to you.\
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多项选择题

接种乙肝疫苗时应注意些什么（）

A.乙肝疫苗中加有氢氧化铝吸附剂，使用时要充分摇匀

B.乙肝表面抗原（特别是HbeAg）阳性母亲的新生儿，亦可与乙肝免疫球蛋白（HBIG）联合使用

C.一般易感者使用20微克

D.如有安瓿破裂、变质、有摇不散的块状物不得使用
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