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问题 单项选择题 A1型题

非甾体抗炎药引起急性胃炎的主要机制是（）

A.激活磷脂酶A

B.促进促胃液素合成

C.抑制前列腺素合成

D.抑制前弹性蛋白酶

E.抑制脂肪酶

答案

参考答案：C

解析：非甾体抗炎药可直接损伤胃黏膜上皮层，并通过抑制环氧合酶作用而抑制胃黏膜生理性前列腺素的产生，从而破坏黏膜屏障。故选C。

选择题

I would like to buy the black pen because I ______that kind of pen ______well.

A．have told ;writes

B．was told;wrote

C．have been told;writes

D．have been told;is written
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单项选择题

Each box is an activity; the number it contains is the duration of the activity in days. The duration of the critical path is ______.
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