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【单选题】
可识别DNA的特异序列，并在识别位点或其周围切割DNA的一类酶称（ ）A.
限制性外切核酸酶
B.
限制性内切核酸酶
C.
非限制性外切核酸酶
D.
非限制性内切核酸酶
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举一反三
【单选题】The Beatles began to be popular in the USA. A. in the 1960s
B.
in the year1960
C.
in 1960’s
D.
in 1960
【单选题】Lots of them were pulled down _______. [ ]
A.
in 1960s
B.
in 1960's
C.
in the 1960s
D.
in the 1960
【单选题】________ that the trade between the two countries reached its highest point. A) During the 1960 ’ s B) It was in the 1960 ’ s C) That it was in the 1960 ’ s D) It was the 1960 ’ s ( B )
A.
B.
C.
D.
D
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