1.选择题- (共5题)
1.
下列变异实例不能遗传的是( )
A.人的体细胞中若多一条第21号染色体,将表现为先天愚型 | B.把相同的小麦种子,播种在水肥条件不同的环境里,所结子粒的饱满程度不同 |
C.应用空间技术育种培育的太空椒 | D.一对无耳垂的夫妇生了一个有耳垂的孩子 |
2.
下列变异实例不能遗传的是( )
A.人的体细胞中若多一条第21号染色体,将表现为先天愚型 | B.把相同的小麦种子,播种在水肥条件不同的环境里,所结子粒的饱满程度不同 |
C.应用空间技术育种培育的太空椒 | D.一对无耳垂的夫妇生了一个有耳垂的孩子 |
3.
小华和他的兴趣小组利用如图所示的滑轮组进行实验,人以600N的力向下拉绕在滑轮组上的绳子的一端,10秒钟绳子下端移动了1.5m,重物上升0.5m,已知该滑轮组的效率为70%(g取10N/kg)。
(1) 画出小华兴趣小组所用滑轮组的绕线情况;
(2) 人的拉力做功的功率是多少?
(3) 被吊起重物的质量是多少?
4.
小华和他的兴趣小组利用如图所示的滑轮组进行实验,人以600N的力向下拉绕在滑轮组上的绳子的一端,10秒钟绳子下端移动了1.5m,重物上升0.5m,已知该滑轮组的效率为70%(g取10N/kg)。
(1) 画出小华兴趣小组所用滑轮组的绕线情况;
(2) 人的拉力做功的功率是多少?
(3) 被吊起重物的质量是多少?
5.
30多年前,我国著名生物学家童第周多次观察到:受精卵去掉细胞核后还能进行正常的分裂,但到原肠期(进入原肠期后,细胞开始分化)就停止了发育.下列对这种现象的分析和推理,与观察到的事实相矛盾的是()
2.单项选择- (共8题)
6.
Of the equipment we have produced, this sells best, for it has the advantage over ________ of working efficiently.
A.the others | B.the rest | C.others | D.another |
7.
The observations which he reported __________ marketing bothered his boss a lot.
A.being concerned | B.concerned | C.be concerned | D.concerning |
8.
________ over everything whenever we want to make a decision, many people believe, and we will have less chance of making mistakes.
A.To think | B.Think | C.Thinking | D.Thought |
9.
A ___________ identification card is required when you purchase foreign money from the Bank of China.
A.valid | B.fruitful | C.beneficial | D.effective |
10.
Staff are allowed to take a ten-minute break every two hours to relax, use the bathroom or do ___________ else is necessary.
A.something | B.anything | C.whatever | D.what |
11.
Bungee jumping is an exciting activity, very popular among young adults, ___________ courage matters more than strength.
A.whose | B.that | C.of which | D.where |
12.
Remember when you learned to water ski, David? _________ you skied more, you got better and better. It’s the same with language study.
A.although | B.while | C.as | D. unless |
13.
一Mary said Mark started the fight and that David simply defended himself.
一 I don’t believe it. Those two hate each other. Anyway, ___________.
一 I don’t believe it. Those two hate each other. Anyway, ___________.
A.It takes two to tango.团结才是力量 |
B.Two wrongs don’t make a right.两个错加不出一个正确来。 |
C.Attack is the best means of defense.进攻是最好的防御。 |
D.You can take a horse to water, but you can’t make it drink.你可以把马牵到水边,但你不能让它喝水。 |
试卷分析
-
【1】题量占比
选择题:(5道)
单项选择:(8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:0
7星难题:0
8星难题:7
9星难题:1