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问题 单项选择题 A2型题

男性，48岁。患原发性高血压后，及时就医并严格执行医嘱。此行为属于（）。

A.日常健康行为

B.避开有害环境行为

C.保健行为

D.预警行为

E.戒除不良嗜好行为

答案

参考答案：C

解析：保健行为指有效、合理利用卫生资讯，维护自身健康的行为，如定期体检、预防接种、患病后及时就医、遵医嘱等行为。

单项选择题

根据《中华人民共和国外汇管理条例》，外汇现钞指的是（）。

A.纸币和铸币

B.银行存款凭证

C.银行卡

D.特别提款权
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单项选择题

The great advance (91) rocket theory 40 years ago showed that liquid-fuel rockets were far (92) in every respect to the skyrocket with its weak solid fuel, the only kind of rocket then known. (93) , during the last decade, large solid-fuel rockets with (94) fuels about as powerful as liquid fuels have (95) their appearance, and it is a favorite layperson’s question to (96) which one is "better". The question is meaningless. (97) might as well ask whether a gasoline or a diesel engine is "better". It all (98) on the purpose. A liquid-fuel rocket is complicated, (99) has the advantage that it can be controlled beautifully. The burning of the rocket engine can be stopped completely; it can be reignited when (100) . (101) , the thrust can be made to vary by adjusting the speed of the fuel pumps. A solid-fuel rocket, on the other hand, is rather (102) in construction, (103) hard to build when a really (104) size is desired. But once you have a solid-fuel rocket, it is ready for action (105) very short notice. A liquid-fuel rocket has to be fueled first and cannot be (106) readiness for very long after it has been fueled. (107) , once a solid-fuel rocket has been ignited, it will keep burning. It cannot be stopped and reignited (108) desired (it could conceivably be stopped and reignited after a pre-calculated time of burning has elapsed, and its thrust cannot be varied. Because a solid-fuel rocket can be kept ready for a long time, most military missiles (109) solid fuels, but human-piloted spaceflight needs the fine adjustments that can (110) be provided by liquid fuels.

A．for

B．with

C．on

D．at
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