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【单选题】
The first step in a PCR cycle is to heat the sample to 95°C. What is the purpose of heating the sample?A.
To allow the primer to anneal to the template
B.
To separate the two strands of DNA
C.
To produce the optimal temperature for Taq dna polymerase to work
D.
To produce the optimal temperature for most enzymatic reactions
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【单选题】1985年黄海高程系采用25年潮汐记录资料推算出的大地水准面为基准,引测出水准原点的高程为( )m。
A.
72.263
B.
72.262
C.
72.261
D.
72.260
【单选题】那孩子遇上麻烦时,通常 向 老师 寻求帮助。( turn to )
A.
That child usually turns to his teacher for help when he meet troubles.
B.
That children usually turns to his teacher for help when he meets troubles.
C.
That child usually turns to his teacher for help when he meets troubles.
D.
That child usually turn to his teacher for help when he meet troubles.
【单选题】那孩子遇上麻烦时,通常向老师寻求帮助。(turn to)
A.
That child usually turns to his teacher for help when he meets friends.
B.
That child usually turns to his teacher for help when he meets troubles.
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