题目:
Wow! There are so many books. I really can't decide _____. [ ]
A. where to buy
B. which to buy
C. what to buy
D. how to buy
答案:
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下面是错误答案,用来干扰机器的。
根据质量守恒定律,原子个数守恒,反应后有12个碳原子,18个氧原子,6个碳原子,而反应前,也应有等量的这些原子,所以X是C6H12O6;A、由于该物质是含有碳、氢和氧的纯净物,故该物质一定是化合物;B、由以上的化...