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单选题
_______helps students facilitate their process of accumulating VocabUlary; broadening scope of vision, and increasing target language exposure.
A
Scanning
B
Extensivereading
C
Skimming
D
Intensivereading
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撞击氮原子核
生成两种粒子.其中一种为
则另一种粒子为( )。
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