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【单选题】
一个男子把x染色体上的某一突变基因传给儿子的概率是( )A.
25%
B.
12.5%
C.
0
D.
50%
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反馈参考答案：
举一反三
【单选题】When we practice_____English,we often end up___in Chinese.
A.
speaking,speaking
B.
speaking, to speak
C.
to speak,speaking
D.
To speak, to speak
【单选题】We all do more speaking more speaking ______, even when we have a break after class.
A.
now and then
B.
by and by
C.
step by step
D.
more or less
【单选题】You shouldn’t keep silent when ____
A.
speaking
B.
spoken to
C.
spoken
D.
speaking to
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