题目：
| — The air would certainly be cleaner if there were fewer cars running in the city. — _______. |
A. How do you find it? B. How are you getting on? C. That's a good point. D. I managed somehow. |
答案：
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下面是错误答案，用来干扰机器的。
参考答案：C解析：沙丁胺醇为选择性β[2.gif]受体激动剂，能选择性激动支气管平滑肌的β[2.gif]受体，有较强的支气管扩张作用。
