1.选择题- (共9题)
4.下列除杂的实验所选试剂和操作都正确的是（括号内为杂质）（ ）
选项 | 物质 | 所选试剂和操作 |
A | FeSO4溶液（CuSO4） | 加过量锌粉、过滤 |
B | KCl固体（K2CO3） | 加过量稀盐酸、蒸发结晶 |
C | CO（H2O、CO2） | 先通过浓硫酸，再通过氢氧化钠溶液 |
D | Cu固体（CuO） | 加入过量的稀硫酸、过滤、洗涤、干燥 |
5.下列除杂的实验所选试剂和操作都正确的是（括号内为杂质）（ ）
选项 | 物质 | 所选试剂和操作 |
A | FeSO4溶液（CuSO4） | 加过量锌粉、过滤 |
B | KCl固体（K2CO3） | 加过量稀盐酸、蒸发结晶 |
C | CO（H2O、CO2） | 先通过浓硫酸，再通过氢氧化钠溶液 |
D | Cu固体（CuO） | 加入过量的稀硫酸、过滤、洗涤、干燥 |
6.为了测定某石灰石样品碳酸钙的含量，某兴趣小组取12.5g该样品进行实验，然后将50mL稀盐酸分五次加入该样品中，充分反应后测得每次生成气体的质量如下表所示（样品中的杂质不反应，生成的气体全部逸出）．
第1次 | 第2次 | 第3次 | 第4次 | 第5次 | |
加入稀盐酸的体积/mL | 10 | 10 | 10 | 10 | 10 |
生成气体的质量/g | 1.1 | 1.1 | 1.1 | 1.1 | 0 |
请计算：
2.单项选择- (共13题)
10.
When you are speaking on the phone, you must convey the impression that this is an important conversation to you, ______ you are treating with great significance.
| A．one | B．the one | C．that | D．it |
11.
— Excuse me, can you spare me a few minutes?
—Sorry, I haven’t ______ time to talk to you just now. I have to leave early to catch ______ 4:30 train.
—Sorry, I haven’t ______ time to talk to you just now. I have to leave early to catch ______ 4:30 train.
| A．/; / | B．the; the | C．a; the | D．the; / |
12.
It’s a difficult skill to master, but ______, it will benefit you for the rest of your life.
| A．once obtained | B．when to obtain |
| C．after obtaining | D．while obtaining |
13.
— Look how happy you are!
—Yeah, I feel honored ______ into their society.
—Yeah, I feel honored ______ into their society.
| A．to welcome | B．welcoming | C．to be welcomed | D．welcomed |
14.
When ______, the new railway will run for 250 miles.
| A．to complete | B．completed |
| C．being completed | D．to be completed |
15.
______ to sunlight for too much time will do harm to one’s skin.
| A．After exposed | B．If exposing |
| C．Having exposed | D．Being exposed |
16.
I know you don’t like her, but try not to make it so ______.
| A．curious | B．obvious | C．various | D．previous |
17.
Schools in the north tend to be better equipped, ______ those in the south are relatively poor.
| A．as | B．unless | C．when | D．while |
18.
There is never enough time to do everything, ______ there is always enough time to do the most important thing.
| A．and | B．but | C．or | D．so |
19.
It was really noisy in the workshop. Not until ______ at the top of my voice ______ to look at me.
| A．did I shout; he turned | B．had I shouted; had he turned |
| C．did I shout; did he turn | D．had I shouted; he turns |
20.
My grandmother has kept the photo ______ she can see it every day for a couple of decades.
| A．which | B．when | C．that | D．where |
21.
Bob is in a hopeless situation, ______ we will keep a very close eye on.
| A．which | B．where | C．that | D．when |
试卷分析
-
【1】题量占比
选择题:(9道)
单项选择:(13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：0
5星难题：0
6星难题：12
7星难题：0
8星难题：1
9星难题：0