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【单选题】
外源性凝血系统的作用起始于A.
第X因子被激活
B.
血小板第3因子的释放
C.
第Ⅻ因子被激活
D.
组织受伤释放组织因子Ⅲ
E.
凝血酶的形成
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举一反三
【单选题】This problem is so difficult that only____ students can work it out .
A.
a few
B.
few
C.
little
D.
a little
【单选题】Please don't force me, this problem is so ___ that I can't solve it.
A.
portable
B.
complex
C.
competitive
D.
typical
【单选题】This math problem is so easy. I think ______ can work it out. [ ]
A.
nobody
B.
somebody
C.
none
D.
anybody
【单选题】This problem is so difficult that only____ students can work it out .
A.
a few
B.
few
C.
a little
D.
little
【单选题】This problem is so tough that only______ students can solve it.
A.
a few
B.
many
C.
a little
D.
much
【单选题】This maths problem is so difcult that only___students can work it out.
A.
a few
B.
few
C.
a little
D.
little
【单选题】This problem is so tough that they can’t find the ____.
A.
way
B.
way out
C.
way off
D.
way in
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