单项选择题

A．Winter is his favorite time for sports.
B．Sports are quite important to him.
C．He should be more enthusiastic.
D．He plays better than he used to.
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单项选择题
That genetically-modified crops could have harmful effects that can be deduced from the fact that ______.
A．cross-breeding is a natural process
B．hybrids are generally more successful at breeding than natural plants
C．gene movement between cultivated plants and wild ones is inevitable
D．new research shows that genetically-modified plants are likely to develop into weeds
单项选择题
A．Drugs have caused American people to have no enough drugs of medical use.B．Drugs have ruined many American people’’s mind.C．Drugs have caused many American people to lose health.D．Both B and C
A．Drugs have caused American people to have no enough drugs of medical use.
B．Drugs have ruined many American people’’s mind.
C．Drugs have caused many American people to lose health.
D．Both B and C
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