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【单选题】
染色质超微结构中的异染色质，下列描述不正确的是A.
相当于染色体的螺旋部分
B.
主要分布在核的核膜内缘
C.
电子密度较低
D.
随着细胞成熟异染色质不断增多
E.
当细胞完全成熟，细胞核内异染色质聚集块状
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【简答题】1450年,_______国人约翰古登堡发明了西方的第一台活字印刷机,从此,奠定了西方早期印刷招贴的开始。
【单选题】Mr Black was doing shopping at the supermarket ______ his mobile phone rang. [ ]
A.
when
B.
while
C.
after
D.
until
【简答题】While black conductors were often motivated by their own painful experiences, whites were commonly driven by religious convictions .
【简答题】阅读理解。 Americans wear black for mourning while Chinese wear white. Westerners think of dragons as monsters. Chinese honor them as symbols of God. Chinese civilization has often shown such polarities (对...
【简答题】Many people take it for granted that black is a color of bad things while white should always mean something good. This may be because, in their opinion, black is related to darkness and white to puri...
【简答题】阅读理解。 Americans wear black for mourning while Chinese wear white. Westerners think of dragons as monsters while Chinese honor them as symbols of God. Chinese civilization has often shown such polariti...
【简答题】阅读理解。 Many people take it for granted that black is a color of bad things while white should always mean something good. This may be because, in their opinion, black is related to darkness and white t...
【单选题】Mrs. Black had her left hand ______while cooking.
A.
burned
B.
burn
C.
to burn
D.
burning
【单选题】(While) smoking was associated with an attention of weight gain among black adults, (no such effect) occurred among white men or women, the latter (was) the group (most likely) to smoke for weight con...
A.
While
B.
no such effect
C.
was
D.
most likely
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