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【单选题】
抗组胺药H1受体拮抗剂药理作用是A.
有相反的药理作用，发挥生理对抗效应
B.
和组胺起化学反应，使组胺失效
C.
能与组胺竞争H1受体，使组胺不能同H1受体结合而起拮抗作用
D.
能稳定肥大细胞膜，抑制组胺的释放
E.
以上都不是
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举一反三
【单选题】I had told them the reason, ______ I didn't attend the meeting.
A.
for which
B.
for what
C.
for that
【单选题】I had told them the reason, ______ I didn't attend the meeting.
A.
for which
B.
at which
C.
for whom
D.
why
【单选题】Although I had told them not to keep me waiting, they made no ______ to speed up the deliveries.
A.
trial
B.
attempt
C.
action
D.
progress
【单选题】I had told them the reason, _____ I didn't attend the meeting.
A.
why
B.
for which
C.
at which
D.
for whom
【单选题】I had told them the reasons, ___I didn't attend the meeting.
A.
why
B.
for which
C.
that
D.
which
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