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【单选题】
关于抑癌基因的说法正确的是A.
抑癌基因又称为肿瘤分化抑制基因
B.
是一类可编码对肿瘤形成起促进作用的蛋白质的基因
C.
呈隐性作用方式
D.
可以使细胞丧失生长控制和正性调控功能
E.
正常情况下促进细胞增殖、抑制细胞分化
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举一反三
【单选题】There are many reasons underlying today's environmental problems EXCEPT ______.
A.
accelerating decline in the quality of the environment
B.
rapidly expanding human population
C.
advancing technology
D.
growing demands in the environment
【单选题】What has the telephone done to us, or for us, in the hundred years of its existence? A few effects suggest themselves at once. It has saved lives by getting rapid word of illness, injury, or fire from...
A.
The telephone has helped to save people from illness and fire.
B.
The telephone has helped to prevent wars and conflicts.
C.
The telephone has made the modern city neither better nor worse.
D.
The telephone has had positive as well as negative effects on us.
【简答题】量化位数决定了音乐的____,指的是每个采样点所代表音频信号的____。
【单选题】The word 'accentuate' ( Line 4, Para. 3) most probably means '______'.
A.
relieve
B.
accelerate
C.
worsen
D.
improve
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