数学文化主要是关于()的课程。
A、数学知识
B、数学理论
C、数学应用
D、数学思想
参考答案:D
The () in e-mail messages has affected almost every computer around the world and has caused the damage of up to US$1 billion in North America.
A.illness
B.virus
C.weakness
D.attachment
汉语中的词类(词的语法分类)可以首先分出的两个大类是()
A.基本词和非基本词
B.实词和虚词
C.典型词和兼类词
D.体词和谓词