(多选题)49: 在R上定义f，当x为有理数时f(x)=1，当x为无理数时f(x)=0，则（ ） A: f在R上处处不连续 B: f在R上为可测函数 C: f几乎处处连续 D: f不是可测函数 ...

(多选题)44: 在R上定义f，当x为有理数时f(x)=1，当x为无理数时f(x)=0，则（ ） A: f在R上处处不连续 B: f在R上为可测函数 C: f几乎处处连续 D: f不是可测函数 ...

(多选题)19: 具体来说,教师在设计、组织幼儿园艺术活动时应遵循以下基本原则 :( )。 A: 审美性原则 B: 低控制原则 C: 创造性原则 D: 趣味性原则 ...

(单选题)19: ____to the Chinese Culture Club.You can learn Beijing opera here. A: Coming B: Welcome C: Well come D: Will come ...

(单选题)39: E-mail, as well as telephones,____________an important part in daily communication. A: is playing B: have played C: are playing D: play ...

(单选题)24: A thousand miles no longer____________much to us today, for modern jets can easily get us to a great distance within a matter of a few hours. A: meant B: means C: mean D: will mean ...

(单选题)39: The music was so loud. That's ____________he left the party so early. A: how B: why C: what D: when ...

(单选题)29: —Do you mind telling me where you're from? —_________. A: Certainly. I'm from London B: Sure. I was born in London C: Not really, you can do it D: Certainly not. I'm from London ...

(单选题)14: I'd rather you____________make any comment on the issue for the time being. A: don't B: wouldn't C: shouldn't D: didn't ...

(单选题)29: "Did you enjoy last night's concert?""Yes. Though the last piece____________rather poorly. " A: was played B: played C: was playing D: playing ...