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【单选题】
Soical Security in the U.S. is increased ______.A.
before inflation occurs
B.
automatically as the living cost rises
C.
automatically as the living cost drops
D.
at the request of retired people
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【简答题】试比较补体系统活化的三条途径的异同点A. 补体系统激活有经典途径．MBL途径及旁路途径，它们的相同点表现为：一旦形成C3转化酶后，作用C3裂解，形成C5转化酶，相继作用C5裂解，然后依次激活补体其他成分，形成膜攻击复合物C56789导致细胞膜破裂．细胞死亡。主要不同点表现为；比较项目 经典激活途径 MBL途径 旁路途径激活...
【单选题】Nothing is so easy as parents raise their expectations of their children too high.
A.
of
B.
to
C.
by
D.
for
【单选题】Nothing is so easy as ________ parents to raise their expectations of their children too high.
A.
of
B.
for
C.
by
D.
to
【单选题】Nothing is so easy as ________ parents to raise their expectations of their children too high. (2012·福建，33)
A.
of
B.
to
C.
by
D.
for
【单选题】Nothing is so easy as _____ parents to raise their expectations of their children too high. [ ]
A.
of
B.
to
C.
by
D.
for
【简答题】观看以下视频,回答问题。
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