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【单选题】
PCR 技术扩增DNA,需要的条件是 1目的基因2引物3四种脱氧核苷酸4DNA聚合酶等5mRNA6核糖体A.
①②③④
B.
②③④⑤
C.
①③④⑤
D.
①②3⑥
E.
①②③⑤
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【单选题】Few years ago, when people in China went shopping, they had to bring cash or in some large cities, some might choose to pay with cards, but now a cashless trend is taking hold with ______ payments!
A.
credit
B.
mobile
C.
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D.
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A.
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B.
A bottle of wine
C.
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D.
A beautiful clock
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