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听力原文:W: How are you getting on, White? Are you still working for the Merry Lynch Bank? M: Yes, Kitty, that's right. W: I suppose you know quite a lot about banking by now, don't you? M: Oh, yes. To tell you the truth I'm a bit tired of it. W: Really? Isn't it good to work in a bank? M: You know I've been working for the Merry Lynch Bank for over 15 years. W: So you are thinking of making a change, are you? M: Yes, I am. Actually, you know, I'm thinking of beginning my own business. W: That sounds great. M: Yes, I think it over, but the problem is money. If I had enough money. I'd leave the bank tomorrow. W: What ale you going to do to solve the problem? M: I'll borrow some money from a bank, of course, but not from the one I've been working for. Q6: How does White like his work? (8)
A.
He is interested in his work.
B.
He is proud of his work.
C.
He is tired of his work.
D.
He is keen on his work.
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【单选题】进行煎煮法提取时,不会用到的仪器是()
A.
水浴
B.
电炉子
C.
烧杯
D.
玻璃棒
【简答题】阅读下列算法说明和代码,将应填入(n)处的语句写在对应栏内。 【说明】 本程序用古典Eratosthenes;筛选法求从2起到指定范围内的素数。如果要找出2~10中的素数,开始时筛中有2~10的数,然后取走筛中最小的数2,宣布它是素数,并把该素数的倍数都取走。这样,第一步以后,筛子中还留下奇数3、5、7、9;重复上述步骤,再取走最小数3,宣布它为素数,并取走3的倍数,于是留下5、7。反复重复上述步...
【单选题】1953年,发生在日本熊本县水俣湾著名的环境公害“水俣病事件”是由哪种污染物引起的()
A.
B.
C.
D.
【单选题】Why is not mentioned in the passage?(passage 2)
A.
Exercising before bed
B.
Sleeping in the afternoon
C.
Playing video s at night
D.
Reading bed
【单选题】H 3 AsO 3 与SnCl 2 在浓盐酸中可发生以下反应: 3SnCl 2 +12Cl - +2H 3 AsO 3 +6H + =2As+3M+6H 2 O 关于该反应的说法中正确的组合是 [     ] ① 氧化剂是H 3 AsO 3 ; ② 还原性:Cl - >As; ③ 每生成1 mol As,反应中转移电子的物质的量为2 mol; ④ M为SnCl 6 2- ; ⑤ M是氧化产物。
A.
①④⑤
B.
①②⑤
C.
①③④
D.
①③⑤
【单选题】下列反应中,不属于氧化还原反应的是 [     ]
A.
3Fe + 4H 2 O == Fe 3 O 4 + 4H 2
B.
2Na + 2H 2 O == 2NaOH + H 2 ↑
C.
SnCl 4 + 2H 2 O == SnO 2 + 4HCl
D.
2Na 2 O 2 + 2CO 2 == 2Na 2 CO 3 + O 2
【单选题】下列反应中,不属于氧化还原反应的是(  ) ①3Cl 2 +6KOH═5KCl+KClO 3 +3H 2 O ②2NO 2 +2NaOH═NaNO 3 +NaNO 2 +H 2 O ③SnCl 4 +2H 2 O═SnO 2 +4HCl ④3CCl 4 +K 2 Cr 2 O 7 ═2CrO 2 Cl 2 +3COCl 2 +2KCl.
A.
①②
B.
①③
C.
③④
D.
②④
【简答题】SnCl 2 + H 2 O——
【判断题】分析纯的SnCl 2 H 2 O不能作滴定分析的基准物,其原因是易被氧化为Sn 4+ 。
A.
正确
B.
错误
【简答题】异丁烯在(CH 2 Cl 2 )中用SnCl 4 -H 2 O引发聚合。聚合速率R p ∝[SnCl 4 ][H 2 O][异丁烯] 2 。起始生成的聚合物的数均分子量为20000,1g聚合物中含3.0×10 -5 mol的羟基,不含氮。 写出该聚合反应的引发、增长、终止基元反应方程式。推导聚合反应速率和聚合度的表达式。什么情况下聚合速率对水或SnCl 4 是零级反应、对异丁烯是一级反应?
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