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【单选题】
核酸中稀有碱基含量最多的是
A.
rRNA
B.
mRNA
C.
tRNA
D.
hnRNA
E.
snmRNA
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【简答题】阅读短文，选择正确答案。 Are you carrying too much on your back to school? I'm sure lots of your age will say 'Yes'. Not only the students in China have this problem, but children in the United States also have h...
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