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【单选题】
关子胎膜构成正确的是（ ）A.
由绒毛膜和羊膜组成，内层为绒毛膜
B.
由绒毛膜和羊膜组成，内层为羊膜
C.
由底蜕膜和羊膜组成
D.
由包蜕膜和绒毛膜构成
E.
由真蜕膜和羊膜组成
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皮皮学刷刷变学霸
举一反三
【单选题】Jack Ma(Ma Yun), CEO of ALIBABA.COM，first touched a computer in 1995, _______ he visited a friend living in Seattle. A. where
B.
when
C.
on which
D.
that
【简答题】[A] signal [B] sign [C] sigh [D] assign
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【单选题】The four hours' examination made him so tired that he ______ a sigh of relief the instant the bell rang.
A.
breathed
B.
spit
C.
bred
D.
uttered
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【单选题】(Annoying) at the long check-out lines, the shopper began (to sigh) loudly, tap his (foot), and (glance) at his watch.
A.
Annoying
B.
to sigh
C.
foot
D.
glance
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