(单选题)7: 下列函数在点x=0处连续但不可导的是( )。 A: 1/x B: |x| C: x^2 D: lnx ...

(单选题)1: 设x和y分别是同一变化中的两个无穷大量，则x-y是（ ）。 A: 无穷大量 B: 无穷小量 C: 常数 D: 不能确定 ...

(单选题)20: He is a doctor, so ( ). A: he does wife B: is his wife C: his wife is ...

(单选题)14: He came here a year ( ), and I have been here ( ) two years. A: ago, for B: before, in C: before, for ...

(单选题)8: He went on with his work ( ) the difficulties. A: in spite of B: although C: out of spite ...

(单选题)2: We worked all day, ( ) we didn't finish it. A: also B: or C: but ...

(单选题)21: He looks tired, he ( ) too little sleep. A: must have B: must have had C: must have been ...

(单选题)15: I think you need to speed ( ) a bit - we're going to be late. A: fast B: in C: up ...

(单选题)9: You’d better stop ( ). We’re listening to the news. A: to talk B: talking C: talk ...

(单选题)3: Do you know whether he is on holiday or ( )? A: in business B: on business C: to work ...