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【单选题】
下列有关短串联重复序列的描述错误的是()A.
mtDNA的编码区和控制区中都存在短串联重复序列；
B.
mtDNA中的短串联重复序列主要集中在D环控制区；
C.
mtDNA中的串联重复序列与核DNA的串联重复序列长度相近、重复次数也相近；
D.
mtDNA编码区中的重复序列一般不发生重复次数的改变；
E.
mtDNA中串联重复序列发生改变的区域主要是D环控制区以及编码区之间的非编码序列。
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【单选题】― Has Jackson finished his work today? ― I have no idea, but he ______ it when I saw him this morning.
A.
had done
B.
would do
C.
was doing
D.
would have done
【简答题】Spoken English is not well planned, but ______.
【单选题】一So you didn’t say “hello” to him last night? 一Well，I stopped and smiled when I saw him，but he _______me and walked on.
A.
ignored
B.
refused
C.
denied
D.
missed
【简答题】相撲 練習二 二、2、
【单选题】—So why didn't you say 'hello' to him yesterday? —Well, I stopped and smiled when I saw him, but he _____ me and walked on. [ ]
A.
ignored
B.
refused
C.
denied
D.
missed
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