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【判断题】
基因工程指人们利用分子生物学的理论和技术，自觉设计、操纵、改造和重建细胞的遗传核心A.
正确
B.
错误
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【单选题】Some students find certain grammar points and structures very difficult; _____, teachers need a reliable source of practice material to get these points across effectively. [ ]
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however
B.
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C.
even so
D.
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【单选题】I really don’t know for certain____ they discussed.this important event very secretly.
A.
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A.
Y
B.
N
C.
NG
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