题目内容

DNA分子整体都具有强的电负性，因此没有极性。

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Shop owners often hire moonlighting police as parking attendants so that shoppers
[A] can stay longer browsing in the store.
[B] won't have trouble parking their cars.
[C] won't have any worries about security.
[D] can find their cars easily after shopping.

非组蛋白染色体蛋白负责30nm纤丝高度有序的压缩。

[A] matters
[B] occasions
[C] events
[D] situations

下图表示2005-2008年工业企业单位总数变化趋势正确的是()．