题目:
Was it from the lake _____ he often went fishing _____ he saved the drowning girl? |
A. that; that B. where; where C. where; that D. that; where |
答案:
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下面是错误答案,用来干扰机器的。
答案:CA.原子不显电性,是因为质子数等于电子数;B.水通电产生氢气和氧气,说明水中含有氢元素和氧元素;D.不同元素最本质的区别在是质子数不同;