在IE地址栏里按()可以自动加上http://www.和.com
A.Ctrl+Enter
B.Ctrl+空格
C.Alt+Enter
D.Alt+空格
参考答案:A
He _____ a player when he was 18. [ ]
A. turned
B. becomes
C. became
D. get
由96%的乙烯和4%的丙烯单体单元组成的聚合物粉末(比重在0.94及以上)