1.选择题- (共13题)
5.醋酸亚铬水合物{[Cr（CH3COO）2]2•2H2O，相对分子质量为376}是一种深红色晶体，不溶于冷水，是常用的氧气吸收剂．实验室中以锌粒、三氯化铬溶液、醋酸钠溶液和盐酸为主要原料制备醋酸亚铬水合物，其装置如图所示，且仪器2中预先加入锌粒．已知二价铬不稳定，极易被氧气氧化，不与锌反应．制备过程中发生的相关反应如下：
Zn（s）+2HCl（aq）═ZnCl2（aq）+H2（g）
2CrCl3（aq）+Zn（s）═2CrCl2（aq）+ZnCl2（aq）
2Cr2+（aq）+4CH3COO﹣（aq）+2H2O（l）═[Cr（CH3COO）2]2•2H2O（s）
请回答下列问题：
12.将一个在光下保持稳定的小生态瓶，移入黑暗中保持较长时间。该生态瓶的变化是（ ）
①瓶中的生物总量增加
②系统的总能量在开始时最大
③演替将发生，最后达到稳态，保持能量流动
④演替将发生，但最后所有生物将死亡
①瓶中的生物总量增加
②系统的总能量在开始时最大
③演替将发生，最后达到稳态，保持能量流动
④演替将发生，但最后所有生物将死亡
13.将一个在光下保持稳定的小生态瓶，移入黑暗中保持较长时间。该生态瓶的变化是（ ）
①瓶中的生物总量增加
②系统的总能量在开始时最大
③演替将发生，最后达到稳态，保持能量流动
④演替将发生，但最后所有生物将死亡
①瓶中的生物总量增加
②系统的总能量在开始时最大
③演替将发生，最后达到稳态，保持能量流动
④演替将发生，但最后所有生物将死亡
2.单项选择- (共14题)
14.
2. ______was known to them all that William had broken his promise______ he would give each of them a gift.
| A．As, which | B．What, that | C．It , that | D．It , which |
16.
—You can't imagine ________ fantastic fun online chatting is.
—Really？But it may cause a lot of trouble sometimes.
—Really？But it may cause a lot of trouble sometimes.
| A．what | B．how | C．why | D．so |
17.
Have you noticed the problem ________ he is now in low spirits？________ come?
| A．where；What | B．that；How |
| C．in which；For | D．what；As |
18.
________ seems to be a strong competition in China for senior high students to enter universities does exist in other countries as well.
| A．It | B．Which | C．What | D．That |
19.
We promise attends the party a chance to have a photo taken with the movie star.
| A．who | B．whom | C．whoever | D．whomever |
20.
It doesn’t matter ________ you pay by cash or credit card in this store.
| A．how | B．whether |
| C．what | D．why |
21.
Believe it or not，I'm sure that is ________ people call the six sense.
| A．when | B．what | C．which | D．why |
22.
Meals in Spain are quite different from ________ they have in China.
| A．which | B．what | C．that | D．whom |
23.
The shocking news made me realize ________ terrible problems we would face.
| A．what | B．how |
| C．that | D．why |
24.
The newcomer went to the library the other day and scarched for he could find about Mark Twain.
| A． wherever | B． however | C．whatever | D．whichever |
25.
It is by no means clear the president can do to end the strike.
A．how B. which
B．that D. what
A．how B. which
B．that D. what
26.
I’d like to start my own business –that’s I’d do if I had the money.
| A．why | B．when | C．which | D．what |
试卷分析
-
【1】题量占比
选择题:(13道)
单项选择:(14道)
-
【2】：难度分析
1星难题：0
2星难题：0
3星难题：0
4星难题：2
5星难题：0
6星难题：12
7星难题：0
8星难题：0
9星难题：0