题目

A man may usually be known by the books he reads _____ by the friends he keeps. A. as usual             B. as soon as   C. as if                D. as well as 答案：D 解析: as well as连接两个并列成分，意为“也”。化学用语填空（1）氩气_____。（2）3个镁离子_____。（3）二氧化氮_____。（4）地壳中含量最多的金属元素和非金属元素形成的化合物_____。（5）澄清石灰水溶液的溶质_____。