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【单选题】
有关质粒的叙述,下列哪错误的?A.
小型环状双链DNA分子
B.
可小到2～3Kb大到数百个Kb
C.
能在宿主细胞中独立自主地进行复制
D.
只有一种限制性核酸内切酶切口
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反馈参考答案：
举一反三
【简答题】A. Live near to a noisy street. B. Watch TV before bed. C. Play on your cell phone before bed. D. Stop drinking tea or coffee early in the day.
【单选题】You _______ watch TV before bed. It will stop you from sleeping.
A.
should
B.
shouldn't
C.
have to
【单选题】Section A Directions: In this section, there are 10 incomplete sentences. You are required to complete each one by deciding on the most appropriate word or words from the 4 choices marked A, B, C and ...
A.
only if
B.
unless
C.
lest
D.
except that
【单选题】How often is the bus scheduled to pass their stop?
A.
Every 21 minutes.
B.
Every hour.
C.
Every 30 minutes.
D.
Every 9 minutes.
【单选题】Trains stop here in order to ______ passengers.
A.
get off
B.
pick up
C.
pull up
D.
bring up
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