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【单选题】
已知向量 a ， b 满足 a · b = 0 ，| a |=1，| b |=2，则|2 a - b |= [ ]A.
0
B.
C.
4
D.
8
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举一反三
【单选题】The girl is _____ beautiful ____ she may become a film star when she grows up.
A.
too; to
B.
such; that
C.
so; that
D.
so; to
【简答题】新材料的发明、应用和开发,往往是人类社会文明发展进程的里程碑,绪论中将材料的发展分成了五个阶段,依次包括( )、( )(细分为青铜器材料和铁器材料)、( )、( )、( )。
【简答题】If the neutron star is very large(much bigger than our sun)the process of shrinking may be so intense that a black hole______(result).
【判断题】In narrative, the experience or event may be in the past, may be what people usually do, or may be going on now.
A.
正确
B.
错误
【判断题】A first-person narrative may be more graphic and lifelike; the scope of the narrative may be limited.
A.
正确
B.
错误
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