防化手套可用于防护（）等。
A、油类
B、酸类
C、腐蚀性介质
D、酒精
E、切割
参考答案：A, B, C, D
一台IBM-PC机，内存容量是8MB，则此PC机采用的CPU型号至少应当是
A．80486
B．80386
C．80286
D．8088
The number of people who _____ English as a foreign language _____ more than 750 million.
[ ]
A. learns; is
B. learn; are
C. learns; are
D. learn; is
