The changes in the city will cost u8 a lot of money，________they will saVe us money in the future．
A. for
B. since
C. but
D. or
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关于城市综合交通内容的完整表述，正确的是（）
A. 城市中及与城市相关的各种交通形式
B. 市区及市区以外的道路网络
C. 城市道路交通、城市轨道交通、水上交通
D. 公路交通、铁路变通、航空交通、水上交通
（）You never told US why you were late for the party，__________？
A. weren't you
B. didn’t you
C. had you
D. did you
已知等差数列{an}，an+2=2an+1-3n+1，则第5项a5等于（） (A)23 (B)20 (C)17 (D)14
The mainDifference between a nurse—manager and a head nurse is that the former
A. is a member of the Medical Executive Committee of the hospital
B. has to arrange the work shifts of the unit's nurses
C. can makeDecisions concerning the medical treatment of a patient
D. has full responsibility in the administration of the unit’s nurses
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