题目

This television documentary will show you ________ 70 years ago.A.how our city Wuxi looked like B.what did our city Wuxi look likeC.what our city Wuxi looked like D.how did our city Wuxi look like 答案：【答案】C【解析】考查宾语从句语序和时态。句意：这部电视纪录片将会向你展示70年前无锡市的样子。这里应该是陈述句语序，而what sb./ sth. looks like又属于一个固定句型，此处指70年前无锡市的样子，应使用一般过去时，所以是what our city Wuxi looked like，故选C项。已知Q元素的相对原子质量A与其原子核内的质子数和中子数之和在数值上相等。若Q2＋核外有x个电子，则其原子核内的中子数为( )A. A＋x＋2 B. A＋x－2 C. A－x－2 D. A＋x＋2