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【单选题】
在减数分裂中，开始出现四分体，非姐妹染色单体发生交叉的时期为A.
偶线期
B.
粗线期
C.
双线期
D.
细线期
E.
终变期
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反馈参考答案：
举一反三
【单选题】I watched the man for a long time and wanted to know .
A.
whether I have seen him before
B.
where I had seen him before
C.
that I had seen him before
D.
when did I see him
【单选题】I had not seen him for years,but I_________ his voice on the phone.
A.
realized
B.
heard
C.
discovered
D.
recognized
【单选题】I kept looking at the man, wondering _______.
A.
whether I have seen him before
B.
whether I had seen him before
C.
that I had seen him before
D.
when I saw him before
【简答题】If I had seen him yesterday, I ______ it to him. (give)
【单选题】It was no use______ that I had not seen him, so I waved to him.
A.
to pretend
B.
pretending
C.
pretended
D.
being pretend
【单选题】_________I had seen him yesterday at the airport! [ ]
A.
If
B.
If only
C.
Only if
D.
Since
【单选题】I would have seen him off, had it been possible but I ______ so busy then.
A.
had been
B.
were
C.
was
D.
would be
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