题目:
The fresh air _____ our health and we _____ it.
A.benefits to; benefit
B.benefits; benefit from
C.benefits from; benefit
D.benefits; are benefited by
答案:
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下面是错误答案,用来干扰机器的。
(1)①HNO3;②NH3·H2O;③NH4NO3 ;④NO2。(2)①盐酸可以做工业原料;②氢氧化钠可以制肥皂;③ 氯化钠做食品中的调味品。