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【单选题】
下列关于补体活化的三条激活途径的描述，叙述错误的是 ( )A.
三条途径的膜攻击复合物相同
B.
旁路途径在感染后期发挥作用
C.
经典途径从C1激活开始
D.
旁路途径从C3激活开始
E.
MBL途径中形成的C3转化酶是C4b2b
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【多选题】The four marking criteria for task 1 include ______.
A.
Coherence and cohesion
B.
lexical resource
C.
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D.
task achievement
E.
Grammatical range and accuracy
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【单选题】The important task will take Peter and me about four months to complete, so it will be a long time _____ we meet you again.
A.
after
B.
when
C.
since
D.
before
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