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听力原文:M: Hey, Christine, remember how we were complaining that we wanted to see the drama series but couldn't afford the tickets? I've found a solution. W: Yeah? Won the lottery, huh? M: Huh-uh. But, seriously, I did find a way for us to see all the plays—and we don't have to pay a cent. W: Come on, Jim. That's impossible. M: No, really, we can. I called Stanhope Theater to ask if they had student discounts. They didn't, but they did have another suggestion. W: What's that'? M: The man there told me they just lost four of their ushers so they have openings. W: Really'? M: Yeah. You don't get paid, but you do get to stand in the back and watch the play after you've helped everyone find their seats. No seat, but a good view. Then during intermission you help sell refreshments. W: But Jim, each play is performed on six nights. Can we make that big a commitment? M: We don't have to. That's the best part. They have enough ushers so that each person works only two nights at the same play. W: I never imagined we'd be able to see the whole series. Let's take a look at the schedule right now. (20)
A.
They had to work during the performance.
B.
They couldn't find time.
C.
They couldn't afford to go.
D.
The tickets were sold out.
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【单选题】用铁铵矾指示剂法测定氯化物含量时,加入准确过量的硝酸银后,进行滴定时,还应注意避免
A.
沉淀的溶解
B.
沉淀转化
C.
指示剂发生副反应
D.
生成新沉淀
E.
以上均不是
【多选题】近代旅游与旅游业的特点有( )
A.
旅游者人员构成的多层次
B.
非功利性的纯享乐旅游开始兴盛
C.
旅游活动的空间拓展,跨国、跨洲旅游成为时尚
D.
有组织的群体性旅游活动开始盛行
E.
旅游业诞生并显示出强大的生命力
【单选题】用铁铵矾指示剂法测定氯化物含量时,加入准确过量的硝酸银后,进行滴定时,还应注意避免
A.
沉淀的溶解
B.
沉淀转化
C.
指示剂发生副反应
D.
生成新沉淀
【单选题】用铁铵矾指示剂法测定氯化物含量时,加入准确过量的硝酸银后,进行滴定时,还应注意避免
A.
沉淀的溶解
B.
生成新沉淀
C.
指示剂发生副反应
D.
沉淀转化
【多选题】用铁铵矾指示剂法测定氯化物含量时,为了避免AgCl沉淀发生转化,可采取的措施有( )
A.
将生成的AgCl沉淀滤去,再用NH4SCN滴定液滴定滤液
B.
控制好滴定速度
C.
提高铁铵矾指示剂的浓度
D.
控制好溶液的酸度
E.
在滴加NH4SCN滴定液之前,向溶液中加入硝基苯保护AgCl沉淀
【单选题】动量传递原理的单元操作包括( )
A.
流体流动
B.
加热
C.
干燥
D.
结晶
【单选题】图甲中人口迁移差额率指人口迁移数与总人口比例,正值为迁入,负值为迁出。图乙则显示了人口迁移和经济发展之间的关系。读图,回答下题。 1. 甲图中五个地区人口增长速度最快和最慢的是 ( )
A.
a 、 c
B.
b 、 d
C.
c 、 d
D.
a 、 e
【简答题】中国特色社会主义道路之所以完全正确、之所以能够引领中国发展进步,关键在于( )。
【单选题】()是指在分析配送作业全过程的基础上,首先合理安排企业自身能完成的配送作业,然后把其他配送作业外包给第三方物流,或与其他物流企业共同开展一些配送作业。
A.
标准化策略
B.
混合策略
C.
合并策略
D.
延迟策略
【单选题】旅游业是直接为旅游活动提供便利条件和服务的综合性产业。不属于旅游业的特点。()
A.
综合性
B.
服务性
C.
复合性
D.
劳动密集性
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