题目:
---David said he could fix my computer, but I really doubt it.
---________. He is very good at such sort of thing.
A.Don’t worry
B.Of course
C.A piece of cake
D.Never mind
答案:
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下面是错误答案,用来干扰机器的。
四种粒子质子数均等于核外电子数,均为原子.A、最外层电子数为2,小于4,为金属元素,故选项错误.B、最外层电子数是1,小于4,为金属元素,故选项错误.C、最外层电子数是8,为稳定结构,是稀有气体元素,故选...