问题
单项选择题
据报道，美国洛杉矶、纽约和日本东京、大阪等地曾多次发生急性中毒烟雾事件，后证实这烟雾是大气中某些污染物在紫外线作用下发生光化学反应所形成的一种混合烟雾。
其主要成分为
A．SO2、NOX、醛类
B．硫酸盐、O3、醛类
C．O4、醛类、过氧酰基硝酸酯
D．硝酸盐、SO2、过氧酰基硝酸酯
E．O3、硝酸盐、硫酸盐
答案
参考答案：C
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据报道，美国洛杉矶、纽约和日本东京、大阪等地曾多次发生急性中毒烟雾事件，后证实这烟雾是大气中某些污染物在紫外线作用下发生光化学反应所形成的一种混合烟雾。
其主要成分为
A．SO2、NOX、醛类
B．硫酸盐、O3、醛类
C．O4、醛类、过氧酰基硝酸酯
D．硝酸盐、SO2、过氧酰基硝酸酯
E．O3、硝酸盐、硫酸盐
参考答案：C
| 阅读理解。 | ||||||||||||||||
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| 1. What is Nick doing for his vacation? | ||||||||||||||||
| A. He's visiting his cousins. B. He's going camping. C. He's going fishing. | ||||||||||||||||
| 2. How long is Nick staying in Shanghai? | ||||||||||||||||
| A. For five days. B. For seven days. C. For eight days | ||||||||||||||||
| 3. Where is Alice staying on July 5th? | ||||||||||||||||
| A. In Shanghai. B. In the countryside. C. At home | ||||||||||||||||
| 4. Is Ben going fishing on July 20th? | ||||||||||||||||
| A. Yes, he is. B. No, he isn't. C. Yes, he isn't. | ||||||||||||||||
| 5. Can Nick go fishing with Ben? | ||||||||||||||||
| A. Yes, he can. B. No. he can't. C. Yes, he can't. |