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【单选题】
α螺旋每上升一圈相当于氨基酸的个数是A.
2.5
B.
2.7
C.
3.0
D.
3.6
E.
4.5
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举一反三
【单选题】—Is Alice still performing? —I'm afraid not. She is said _______ the stage already as she has become a director.
A.
to have left
B.
to leave
C.
to have been left
D.
to be left
【单选题】I'm sorry to have you waiting so long for Marcia, and I'm afraid it'll be ten minutes _______ she comes back. [ ]
A.
before
B.
after
C.
until
【单选题】— Could I speak to Miss Smith, please? — ______. She's gone to the post office. [ ]
A.
I'm afraid not
B.
I think so
C.
Certainly you can
D.
I'm not sure
【单选题】—How anxious Ruby is! I wonder what on earth she ________. —I’m afraid nobody knows. She is always so strange.
A.
has expected
B.
will expect
C.
will have expected
D.
is expecting
【单选题】— Is Alice still performing？ — I’m afraid not. She is said the stage already as she has gone ab
A.
— Is Alice still performing？ — I’m afraid not. She is said ____ the stage already as she has gone abroad for further study. A．to leave
B.
to have left
C.
to be left
D.
to have been left
【单选题】— I'm afraid I have to leave a little earlier. My mother is ill in bed. — ____ I hope she will be all right soon. [ ]
A.
It's nothing.
B.
Nothing.
C.
I'm sorry to hear that.
D.
So she is.
【简答题】细小孔隙内的毛细水既受重力作用，也受表面张力即（ ）作用。
【简答题】 腭骨可分为 ____ 和 ____ 部。
【单选题】--Will Betty join the talent show on Friday? --I’m afraid she won’t. she is too to act in front of other people.
A.
shy
B.
confident
C.
pleased
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