单项选择题

A．He shows great enthusiasm for his studies
B．He is a very versatile person
C．He has no talent for tennis
D．He does not study hard enough
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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
According to the passage, as the corona rays reach the planets, they become ________.
A．hotter
B．clearer
C．thinner
D．stronger
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