为了缓解全球变暖，英国科学家提出将足球场大小的氦气球升到约19千米的高空，并用软管相连，向大气中输送大量微粒，以降低地球的温度。据此并结合下图（数码代表各种辐射），回答下列各题。
关于图中数码代表的辐射，叙述正确的是（）
A．①中能量最强的是紫外线
B．②是对流层大气的根本热源
C．③一般只出现在夜晚
D．④主要是波长较长的红外线
参考答案：D
解析：
读图，①是太阳辐射，其中能量最强的是可见光部分，A错。②是地面辐射，对流层大气的主要直接热源，根本热源是太阳辐射，B错。③上大气逆辐射，白天晚上都存在，C错。④是射向宇宙空间的大气辐射，主要是波长较长的红外线，D对。
补全对话。
Malc went to the Casualiy Department of the hospital. There he was examined by a doctor. DOCTOR: Right. __1__ And lie down on that bed over there.That's right. Now, just hold up your right arm, will you? __2__ MALC : No. DOCTOR: And this? MALC : Yes...a bit...ouch ! DOCTOR: __3__ MALC: Yes. That hurts quite a lot. DOCTOR: And you don't feel any pain anywhere else? In your legs, for example? MALC: __4__ DOCTOR: Well, it's probably nothing serious. But I think we'd better have that shoulder X-rayed. __5__ So it would be better if you stayed in hospital for the night... |