第2题: [单项选择]There are many kinds of metals,______. A. each having its special properties B. having its special properties C. each had its special properties D. each has its special properties 参考答案:A 答案解析:稍加分析可知,逗号前后的两个句子如要构成主从复合句,中间必须有连接词,故可排除C和D。又因前后两部分逻辑主语不一致,不能直接用分词做状语,故可排除B。空格处应选用其自己的逻辑主语的独立主格结构来表示,
第3题: [单项选择]急性阑尾炎的典型腹痛表现为() A. 上腹痛 B. 脐周痛 C. 右下腹痛 D. 全腹痛 E. 转移性右下腹痛 参考答案:E