常染色质是指（）
A.经常存在的染色质
B.染色很深的染色质
C.不呈异固缩的染色质
D.呈现异固缩的染色质
E.转录活性低的染色质
参考答案：C
It is generally said that man's desire is hard ______. [ ]
A. to satisfy
B. to be satisfied
C. to met
D. to being satisfied
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