1.选择题- (共7题)
3.
某同学在研究马铃薯块茎细胞呼吸方式时，设计了如下实验：
实验一：取新鲜马铃薯块茎，洗净、切成碎屑．向锥形瓶中分别加入适量的马铃薯块茎碎屑，安装成图甲装置．每隔一段时间，从分液漏斗向锥形瓶A中注入适量过氧化氢溶液．观察装置中溴麝香草酚蓝水溶液的颜色变化．
实验二：取新鲜马铃薯块茎，洗净、切成碎屑．向锥形瓶C中放入适量的马铃薯块茎碎屑，并向C瓶充入N2替代瓶中空气，安装成图乙装置，一段时间后，观察装置中溴麝香草酚蓝水溶液的颜色变化．
请回答下列问题：
4.
某同学在研究马铃薯块茎细胞呼吸方式时，设计了如下实验：
实验一：取新鲜马铃薯块茎，洗净、切成碎屑．向锥形瓶中分别加入适量的马铃薯块茎碎屑，安装成图甲装置．每隔一段时间，从分液漏斗向锥形瓶A中注入适量过氧化氢溶液．观察装置中溴麝香草酚蓝水溶液的颜色变化．
实验二：取新鲜马铃薯块茎，洗净、切成碎屑．向锥形瓶C中放入适量的马铃薯块茎碎屑，并向C瓶充入N2替代瓶中空气，安装成图乙装置，一段时间后，观察装置中溴麝香草酚蓝水溶液的颜色变化．
请回答下列问题：
2.单项选择- (共12题)
8.
—I phoned you yesterday morning.A girl answered，but I didn’t recognize the voice.
—Oh，it ________ my younger sister.She was in my room at that moment.
—Oh，it ________ my younger sister.She was in my room at that moment.
| A．must have been | B．should have been |
| C．could have been | D．may have been |
9.
In the reading room，we found her ________ at a desk，with her attention ________ on a book.
| A．sitting；fixing | B．to sit；fixed |
| C．seating；fixing | D．seated；fixed |
10.
________ to Anne’s birthday party，Mr Brown is now searching shop after shop for a nice present for her.
| A．Having invited | B．Having been invited |
| C．Have been invited | D．Being invited |
11.
Bless your heart，I know you didn’t break the vase ________.Don’t cry！
| A．on purpose | B．by accident |
| C．on business | D．by mistake |
12.
____ I say Clancy is a smart boy, he still needs to work hard to achieve his goal．
| A．Then | B．When | C．While | D．As |
13.
--Monitor?
--- I’m not monitor of our class. I __ with the teacher until the monitor is elected.
--- I’m not monitor of our class. I __ with the teacher until the monitor is elected.
| A．will just help | B．am just to help |
| C．am just helping | D．have just helped |
14.
The old woman who ________ in the deserted house alone for ten years has been settled in a nursing home now.
| A．lived | B．has lived |
| C．had lived | D．has been living |
15.
—Will you attend the ceremony tomorrow? —What ceremony? I ____ informed of anything about it．
| A．wasn't | B．haven't been | C．hadn't been | D．won't be |
16.
As is known to all, Yang Liwei has become a space hero is we have expected．
| A．that; which | B．what; that | C．what; which | D．that; what |
17.
______ , the players began the game.
| A．Having taken our seats | B．Taking our seats |
| C．Being taken the seats | D．After we had taken our seats |
18.
The new buyer identified a dozen new sources for the material, ___________ proved to be reliable．
| A．most of them | B．most of which | C．most of whom | D．most of those |
试卷分析
-
【1】题量占比
选择题:(7道)
单项选择:(12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：10
7星难题：0
8星难题：2
9星难题：0