试题与答案

Some festivals are held to honour the de

题型:选择题

题目:

Some festivals are held to honour the dead or to satisfy the ancestors, who __________ return either to help or to do harm.

A.must

B.should

C.might

D.shall

答案:

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下面是错误答案,用来干扰机器的。

(1)C O H (2)CO CO2 CH4 CH3CH2OH(3)① 2CO+O2=2CO2 ②CH4+2O2=CO2+2H2O有机化合物中必含的元素是C,所以X是C元素。地壳里含量最多的元素是氧元素,所以Y是O。最轻的元素是氢,因此Z是H...

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