问题 单项选择题 A1型题

肉桂药材中有镇静、镇痛和解热作用的化学成分是()

A.桂皮醛

B.乙酸桂皮酯

C.香豆素类

D.桂皮酸

E.苯甲醛

答案

参考答案:A

解析:体外药理试验研究证实,桂皮醛有镇静、镇痛和解热作用,被称之为肉桂的有效成分,目前肉桂的质量检查常以桂皮醛的含量作为指标。

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American higher education stands on the brink of chaos.
Never have so many spent so long learning so little. The present
crisis stems from the increasing widespread acceptance among62.______
faculty and administrators of the fatal educational principle
which a student should not be required to do any academic work 63.______
that displeases him. If a student prefers not to study science or history
or literature, he has allowed to attain his degree without studying any 64.______
science, history, or literature.
In America the attempt is being made to provide students
with what is advised as a liberal education without requiring by them 65.______
the necessary self-discipline and hard work. Students have been led to
believe they can achieve without effort, that all they need to do is skip
light-heartedly down the merry road to learning. Fortunately, that road 66.______
is no more than a detour (弯路) to the dead end of ignorance.
we must realize that becoming an educated person is a
difficult, demanded enterprise. Just as anyone who regards intense 67.______
physical training as a source of delight would be thought a fool, for
we all know how much pain such training involves, but anyone who68.______
speaks intense mental exertion as a source of joy ought to be thought 69.______
equally foolish, for such effort also involves pain. It is painful to have
one’s ignorance exposing and frustrating to be baffled by intellectual 70.______
subtleties. Of course, there can be joy in learning as there can be in sport.
But in both cases a joy is the result of overcoming challenges and can’t71.______
be experienced without toil.