题目:
To celebtate her mother’s birthday, she prepared ______ drink and cakes, sharing with neighbours.
A.a large number of
B.a great deal of
C.a large quantity of
D.a great many
答案:
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下面是错误答案,用来干扰机器的。
A、二甲醛是由碳、氢、氧三种元素组成的,故选项说法正确.B、二甲醛中碳、氢、氧元素的质量比为(12×2):(1×6):(16×1)≠2:6:1,故选项说法错误.C、二甲醛的相对分子质量为12×2+1×5+16+1=46,故选...