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【单选题】
某双链DNA纯样品中含有20%的A,则该样品中G的含量为A.
15%
B.
20%
C.
30%
D.
60%
E.
80%
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举一反三
【单选题】测试导入单选题12 __________ late for school again, Miles! --- Sorry, I promise that I __________.
A.
选择1 Don’t, won’t
B.
选择2 Don’t be, won’t
C.
选择3 Don’t be, don’t
【单选题】测试导入单选题10.Northern Ireland is small, but it is significant because of the__
A.
选择1 the economic problems
B.
选择2 the political troubles
C.
选择3 the immigration issues
D.
选择4 the national identity
【单选题】The crops failed because of the drought .
A.
cold weather
B.
dry weather
C.
poor soil
【单选题】测试导入单选题3 If he __________ back, I __________ you.
A.
选择1 comes, will tell
B.
选择2 came, told
C.
选择3 will come, will tell
【单选题】The boy failed four times, but he said he would try ___________.
A.
a five time
B.
a fifth time
C.
the five time
D.
the fifth time
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