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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问答题
According to an online dictionary, the definition of boredom is ________ .
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
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