1.选择题- (共6题)
2.研究者发现，Ca2+通道在神经调节和肌肉收缩过程中起重要作用．图1表示由甲、乙、丙三个神经元（部分）构成的突触结构，当兴奋传导至突触小体时，突触间隙中的Ca2+通过Ca2+通道内流，会引起神经递质的释放．图2表示兴奋通过神经骨骼肌接头引起肌肉收缩的部分过程，当乙酰胆碱（Ach）作用于A（Ach受体兼Na+通道）时，产生动作电位，将兴奋传导至B时，C（Ca2+通道）打开，肌质网中Ca2+释放，引起肌肉收缩．请据图回答下列问题．
3.小夏将n个“3V 0.3W”的小灯泡，按照甲、乙两种连接方式分别接入电压为U的电路中（如图所示），通过分别调节滑动变阻器R1和R2，使所有灯泡均正常发光．则甲、乙两电路中的总电流与总功率的关系正确的是（ ）
2.单项选择- (共9题)
7.
Tom’s teacher kept on telling him to practise speaking English, but _______ didn’t work.
| A．he | B．which | C．all | D．it |
8.
I have bought two pens, _______writes well.
A. neither of them B, neither of which C. none of which D. both of which
A. neither of them B, neither of which C. none of which D. both of which
9.
In the 1930s, the two countries were at ______ war, and his father was fighting at _____ front.
| A．the; 不填 | B．不填; the | C．the; the | D．不填;不填 |
10.
We tried to _______ his doubts and let him tell the truth.
| A．replace | B．review | C．remove | D．rebuild |
11.
The competition is fierce .No women or children are allowed to ________.
| A．join | B．take part in | C．compete for | D．attend |
12.
The boss ______ the worker how to do it, or the accident couldn’t have happened.
| A．can’t have told | B．ought to tell | C．could have told | D．mustn’t have told |
13.
—We don’t know who stole the book. What’s your opinion?
—Jack is considered ______ it.
—Jack is considered ______ it.
| A．having done | B．to have done | C．doing | D．to do |
试卷分析
-
【1】题量占比
选择题:(6道)
单项选择:(9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：9
7星难题：0
8星难题：0
9星难题：0