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【单选题】
下列关于细胞结构和功能的叙述，正确的是（）。A.
原核生物的细胞结构中没有线粒体，只能通过无氧呼吸获得能量
B.
核糖体是细胞内蛋白质的“装配机器”，由蛋白质和mRNA组成
C.
细胞分化、衰老和癌变都会导致细胞形态、结构和功能发生变化
D.
蓝藻细胞有丝分裂前后.染色体数目一般不发生改变
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举一反三
【单选题】She racked her brains trying to _____ the maths problem.
A.
work up
B.
work down
C.
work out
D.
work off
【单选题】If the new arrangement doesn’t _____, we’ll go back to the old one.
A.
work over
B.
work out
C.
work up
D.
work down
【单选题】They _____ a small laboratory and devoted every spare moment to this work. [ ]
A.
picked up
B.
put up
C.
set up
D.
grew up
【简答题】It takes courage to stand up at work．Now more and more people are standing up when they are working on something important．Standing up is in fashion．Medical researchers have found that people who stan...
【单选题】--- Have you drawn up that list of names yet? --- No, but I’m going to it.
A.
work out
B.
work on
C.
work off
D.
work up
【简答题】Up to now，the work has been easy.
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