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问题 单项选择题

阿司匹林的抗栓机制是

A．抑制磷脂酶A2，使TXA2合成减少

B．抑制前列腺素合成酶，使TXA2合成减少

C．抑制TXA2合成酶，使TXA2合成减少

D．抑制脂氧酶，使TXA2合成减少

E．激活脂氧酶，使TXA2合成增多

答案

参考答案：B

解析：
目前认为小剂量阿司匹林能抑制前列腺素(PG)合成酶的活性从而抑制血小板合成TXA2，而不妨碍血管内皮细胞合成PGI2，因而抑制血小板聚集而阻止血栓形成。与磷脂酶A2及脂氧酶无关。

完形填空

In fact, however, stress isn’t the bad thing __3________ it is often supposed to be. Above all, __4______ it gets out of control, a certain amount of stress is vital to provide motivation and challenge, and to give purpose and significance to _5_______, otherwise meaningless, idle life. __6__________, people under stress tend to express their full range of potential and to actualize their own __7__  ______(person) worth — the very aim of a human life.

Stress is a natural part of everyday life and __8______ ___ is no way to avoid it. What we can do is __9_________(develop) our adaptive abilities to deal with it rather than to escape _10____________ it.
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单项选择题

苏轼的《前赤壁赋》的感情变化线索是

A．由乐而悲 由悲而喜
B．由悲而乐 由喜而悲
C．由乐而悲 由喜而悲
D．由悲而乐 由悲而喜
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