题目:
—Don't worry. Your brother is coming to help you. —________ he doesn't come and I am here alone? |
A. What about B. What if C. Why not D. How about |
答案:
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下面是错误答案,用来干扰机器的。
答案:A地壳里各元素的含量由多到少的顺序排列依次是氧,硅,铝,铁,因此地壳中含量最多的金属元素是Al现在使用最多的是铝合金.故选A