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【单选题】
下列生物体的基因组成中，能够表现出隐性性状的是（ ）A.
DD
B.
Dd
C.
dd
D.
DD和Dd
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举一反三
【单选题】Only after you explained it to me ____ it was not my teacher’s fault.
A.
I realized
B.
had I realized
C.
realized I
D.
did I realize
【单选题】- Why did you _______ change your mind? -I realized my plan wasn't practical after a long discussion.
A.
easily
B.
successfully
C.
quickly
D.
finally
【单选题】I really don’t know _________ I put my wallet after I paid the bill．
A.
where was it
B.
it was where that
C.
where was it that
D.
where it was that
【单选题】对于铁、铝氧化物类粘土矿物来说,第 条是错误的。
A.
是组成南方红壤、砖红壤的主要粘土矿物
B.
在北方土壤中不存在
C.
是阳性胶体，易吸附阴离子
D.
易导致磷肥被固定（失效）。
【单选题】Pentium主板上的Cache存储器的作用是( )。
A.
提高软盘与主存间的传送速度
B.
提高CPU与外部设备间的传送速度
C.
提高硬盘与主存间的传送速度
D.
提高CPU与主存储器间的传送速度
【单选题】______had I bought the computer______I regretted spending so much money on it.
A.
After that
B.
Not only but
C.
As soon as and
D.
No sooner than
【单选题】It was not _____ she took off her glasses _____ I realized she was a famous film star.
A.
when , that
B.
until , that
C.
until , that
D.
when , then
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