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【简答题】
根据所给句子，选择最佳的应答语。每个选项只能用一次。 ( )1. Why are you late for class? ( )2. If you don't get enough sleep, you'll be exhausted in class. ( )3. Have you ever been an April Fool, Maria? ( )4. Hi, Michael. You look stressed out today. ( )5. By the time I was five, I had started learning English.
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【单选题】PCR扩增基因采用的引物是( )。 A. RNA片段 B. DNA片段 C. 氨基酸片段 D. DNA或RNA片段
A.
RNA片段
B.
DNA片段
C.
氨基酸片段
D.
DNA或RNA片段
【单选题】商家考虑客户端是不是骗子,而客户也会担心网上的商店是不是一个玩弄欺诈的黑店。
A.
信息传输的保密性
B.
交易文件的完整性
C.
信息的不可否认性
D.
交易者身份的真实性
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