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【单选题】
支原体是目前发现的最小、最简单的细胞生物。支原体细胞由下列哪些结构(或物质)构成 ①蛋白质外壳 ②DNA或RNA ③DNA和RNA ④核糖体 ⑤线粒体 ⑥以纤维素为主要成分的细胞壁 ⑦具有选择透过性的细胞膜 [ ]A.
①②
B.
③④⑦
C.
③④⑤⑦
D.
③④⑥⑦
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举一反三
【单选题】According to the author, there are few people who are so addicted to work like Emerson.
A.
Y
B.
N
C.
NG
【单选题】______ is the richest man in our city?
A.
Whom do you think
B.
Who do you think
C.
Do you think who
D.
Who you think
【单选题】Major depressions seem to occur only to people who have a family history of depression.
A.
Y
B.
N
C.
NG
【单选题】The aged prime minister said to the soldiers ______ in the rescue scene,'it is the people who feed you; now you should know what to do.'
A.
friendly
B.
angrily
C.
proudly
D.
firmly
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