文明礼貌的具体要求是()。
A.仪表堂堂
B.语言规范
C.举止优雅
D.待人热情
参考答案:B, D
There is ________ ‘h’ in the word ‘ghost’, but the ‘h’ doesn’t make _________sound.
A.a; a
B.an; a
C.a; the
D.an; the
ATX电源有()引脚。
A.10
B.20/24
C.30
D.40