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【单选题】
二小对于红细胞这一性状为杂合 Ss ,字母 S 和 s 所代表的等位基因是( )A.
位于 X 和 Y 染色体上
B.
为连锁的
C.
位于同源染色体上
D.
两者都存在二小的每一个精子细胞中
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举一反三
【单选题】---Most hotels are very full today. --- Don't worry! I have ______ a room already in the Changjiang Hotel.
A.
bought
B.
booked
C.
visited
D.
seen
【单选题】________table manners, I can’t stand people________with their mouths full. [ ]
A.
Regard; to speak
B.
Regard; speaking
C.
Regarding; speaking
D.
Regarding; to speak
【单选题】I have offered to paint the house __________ a week’s accommodation.
A.
in exchange for
B.
with regard to
C.
by means of
D.
in place of
【单选题】My suitcase was so full that it didn't have ______ for anything else.
A.
spot
B.
room
C.
place
D.
area
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