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【单选题】
细胞期中,决定一个细胞是分化还是增殖的控制点(R点)位于A.
Gl期
B.
S期
C.
G2期
D.
M期
E.
G0期
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【单选题】Hardly ______ the office when it began to rain A. did I leave B. I had left C. I left D. had I left
A.
did I leave
B.
I had left
C.
I left
D.
had I left
【单选题】I left several important _______ in my office. I need to go pick them up.
A.
item
B.
items
C.
term
D.
terms
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