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【单选题】
综合征的主要特点应除外以下哪一项（ ）A.
向右分流的先心病
B.
现为双向或右向左分流
C.
肺动脉压力显著增高
D.
肺缺血，肺动脉段凹陷
E.
晚发性青紫，有杵状指(趾)
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举一反三
【简答题】66666666666
【单选题】Because of climate change, the ice that polar bears depend on for survival .
A.
are slowly disappearing
B.
is slowly disappearing
C.
are slowly disappeared
D.
have slowly disappeared
【简答题】A．They are difficult to read. B．They are slowly falling apart. C．They were not made from wood pulp. D．They should be stored, in a cold place.
【单选题】下列基团从小到大排列正确的是
A.
烷基、醚基、酯基、酮基
B.
烷基、酯基、醚基、酮基
C.
烷基、酮基、醚基、酯基
D.
烷基、酯基、醚基、烯基
E.
烷基、酮基、酯基、醚基
【单选题】which of the following statement is incorrect?
A.
Changes are slowly taking place in all sectors of the British society.
B.
The gap between working -class and middle- class young people is narrowing
C.
different in income will remain but those in occupation will disappear
D.
middle-class people may sometimes feel inferior to working-class people!
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