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邻羟基苯甲酸的结构 ，俗名为水杨酸，在医学上具有解热镇痛和抗炎、抗风湿作用，由于它易刺激胃肠道产生严重的反应，因此通常将它先转化为乙酰水杨酸（阿司匹林），服用后在人体内会缓慢反应生成水杨酸． 请回答下列问题： （1）阿司匹林的分子式为______，其在人体内缓慢反应生成水杨酸的反应类型为______． （2）在阿司匹林溶液中滴入紫色石蕊试液，溶液颜色变红，说明阿司匹林溶液具有______性． （3）生产厂家将乙酰水杨酸制成其钠盐或钙盐，目的是______，以防止刺激胃黏膜．
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【单选题】When he looked for a job, John strongly felt that there was a widespread ____ against men over forty.
A.
prejudice
B.
compromise
C.
indicatio
D.
convenience
【简答题】Mr. Robinson had to travel somewhere on business, and as he was in a hurry, he decided to go by 1 . He liked sitting 2 a window when he was flying, so he got onto the plane and looked for a window sea...
【简答题】Once James Thornhill, a famous English painter, was asked to paint some pictures on the walls of the king's palace in England. Then workers were sent for and a big platform was made. With the help of ...
【单选题】When he looked for a job, John strongly felt that there was a widespread _____ against men over forty.
A.
prejudice
B.
hatred
C.
emphasis
D.
trust
【单选题】—Tom is wise enough to achieve his success. —But in my opinion, he is _________ than wise.
A.
luckier
B.
more lucky
C.
much luckier
D.
rather lucky
【简答题】Mr.Robinson had to travel somewhere on business, and as he was in a hurry, hedecided to go by air. He liked sitting beside a window when he was flying, sowhen he got on to the plane, he looked for a w...
【简答题】他缺少教育,这在找工作时是一个不利条件。 His lack of education was a ___________ when he looked for a job.
【单选题】When he looked ________ his childhood he realized how lucky he was to have so good a teacher.
A.
forward to
B.
down upon
C.
back on
D.
in for
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