题目:
--- I’m afraid that she won’t come to help me as she promised.
--- Don’t worry. Nothing will _____ her mind if she has _____ up her mind.
A.change; made
B.turn; done
C.grow; given
D.make; changed
答案:
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在4P+5O2 点燃 . 2P2O5中,磷和氧气是反应物,五氧化二磷是生成物,则由反应方程式可得:4P+5O2 点燃 . 2P2O54×31 5×32 2×(31×2+16×5)即表示124份质量的磷可跟160份质量的氧气化合,并生成 284份质...