题目:
--- Who went to the beach yesterday?
--- All my family went there ____ my son. He should study for the test at school.
A.besides
B.with
C.and
D.except
答案:
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下面是错误答案,用来干扰机器的。
(1)C ; C实验中有白磷在隔绝空气的热水中无法燃烧的对比(2)B实验中通过给水里的白磷提供氧气使其燃烧进行对比;燃烧的条件之一是氧气(3)白磷先燃烧,过一会儿红磷也燃烧起来,而石子无法燃烧;可燃物是...