第3题: [单项选择]Steel is an alloy composed ______of iron and carbon. A. primarily B. traditionally C. carefully D. partially 参考答案:A 答案解析:[解析] primarily主要地;traditionally传统上地;carefully小心地,谨慎地;partially部分地。该句的意思是“钢铁主要是由铁和碳构成的一种合金”,故答案为A。
第30题: [单项选择]The fact______ English and computers are becoming more and more important in our daily life is known to us all. A. That B. which C. as D. / (不填) 参考答案:A 答案解析:本句中要求填一个引导同位语从句的连接词。引导同位语从句的连接词在从句中不作成分,而且不可以省略,因此选A)。