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【单选题】
第一个作为重组DNA载体的质粒是A.
pBR322
B.
ColE1
C.
pSC101
D.
pUC18
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皮皮学刷刷变学霸
举一反三
【单选题】The writer thinks that teenagers are frightened when they are in charge of themselves because______.
A.
they don't know how to stop a car without brakes
B.
there is no one to ask for help when in trouble
C.
there is no one to guide and discipline them
D.
they are afraid of being left alone
【单选题】D The Cost of Higher Education Individuals (个人) should pay for their higher education. A university education is of huge and direct benefit to the individual. Graduates earn more than non-graduates. M...
A.
taxpayers
B.
pressing calls
C.
college graduates
D.
government resources
【单选题】He holds that education should place more ______ on logic thinking, and education of emotion is of little use.
A.
importance
B.
significance
C.
stress
D.
emphasis
【单选题】It can be inferred that ______.
A.
the writer must have misunderstood the policeman when the latter showed him the way
B.
the policeman must have pointed him a wrong direction
C.
the writer couldn't tell the right from the left
D.
the railway station was the only house in sight
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