计算机文件是指存储介质上
A．所有文字的集合
B．所有声音的集合
C．所有数字的集合
D．所有图形的集合
E．一组相关信息的集合
参考答案：E
根据句意及首字母提示完成单词。
1. We should e________ our thanks to others when they help us.
2. We have entered a p________ in world history when children are all learning English.
3. The number of Chinese s__________ is larger than that of English.
4.-What language is spoken most w________ in the world?
-English.
5. Tom likes painting and his sister shows an i_________ in it, too.
引起中毒作用的粉尘是（）
A.铅、砷、锰粉尘
B.锡、铁、钡粉尘
C.煤、石墨、炭黑、活性炭
D.石棉、矽尘、煤尘
E.面粉、茶尘、花粉
when children are all learning English.
5. Tom likes painting and his sister shows an i_________ in it, too.