声音是由发生体的______产生的，中考期间，考场附近禁止鸣笛，这是在_____

某电器厂组建新的生产车间生产新产品---“彩虹”牌电视机，准备投入国内市场，电视机生产加工工序共有5道，生产时间分别为15、20、25、16、10分钟。电器厂每日工作8小时，A车间日产量为80台，时间利用系数为0.91，次品率为1.5%。

电器厂若一次生产10000台电视机，则生产周期最短为()分钟

A.200000

B.860000

C.250061

D.600000

秦始皇说“天下共苦战斗不息，以有候王，赖宗庙，天下初定，又复立国，是树兵也，而求其宁息气不难哉！”秦始皇为消除这一担心而采取的举措是[     ]

A．推行郡县制

B．焚书坑儒

C．强化中央机构

D．统一文字

社会心理应激源通常可以分为以下几类：______；______；______；______。

右图是1858年英国著名的幽默杂志《笨拙周刊》刊登的反映泰晤士河的一幅漫画“沉默的强盗”。画面为象征死亡的骷髅在泰晤士河上游荡。该图作者的立意是英国工业革命完成后

A．不断对外扩张掠夺殖民地，成为海上强盗

B．社会秩序混乱，泰晤士河上强盗频繁出没

C．泰晤士河的航运业存在着重大的安全隐患

D．环境污染严重，藉以引起对环境问题重视

阅读理解。

     Most people, when they travel to space, would like to stay in orbit for a few days of more. And this

stands to reason, if you're paying $20,000 for your trip to orbit! Strain order for tourism to reach its full

potential there's going to be a need for orbital accommodation---or space hotels. What would a space hotel

actually be like to visit? Hotels in orbit will offer the services you expect from a hotel------private rooms,

meals, bars. But they'll also offer two unique experiences: impressive views----of Earth and space---and

the endless entertainment of living in zero gravity---including sports and other activities that make use of

this.

     The hotels themselves will vary greatly----from being quite simple in the early days to huge luxury

structure at a later date. It's actually surprising that as later as 1997, very few designs for space hotels

were published. This is mainly because those who might be expected to design them haven't expected launch

costs to come down far enough to make them possible.

     Lots of people who've been to space have described vividly what it's like to live in zero gravity. There are

obviously all sort of possibilities for dancing, gymnastics, and zero-G sports. Luckily, you don't need to sleep

much living in zero gravity, so you'll have plenty of time for relaxing by hanging out in a bar with a window

looking down at the turning Earth below.

     Of course all good things have come to an end. Unfortunately, And so after a few days you'll find yourself

heading back enough you'll be much more expert at exercising in zero gravity than you were when you arrived.

You'll be thinking how soon you can save up enough to get back up again---or maybe you should change jobs

to get to work in an orbiting hotel.

1. When traveling in space, most people would like to stay in orbit for a few days because _______.

A. It is expensive to travel in space

B. they would find the possible life in other star systems

C. they could enjoy the luxury of space hotels

D. they want to realize the full potential of tourism

2. Which of the following is a unique experience that space hotels will offer?

A. The gravitational pull

B. The special views.

C. The relaxation in a bar.

D. The space walk.

3. Which of the following is not discussed in the passage?

A. When was the space traveling made possible?

B. What are the unique experiences that space hotels will offer?

C. Why were there not many published designs for space hotels?

D. How can the travelers enjoy themselves in space hotels?

4. This passage is mainly about ________.

A. traveling in space

B. the ways of living in space hotels

C. zero gravity and space hotels

D. the description of space hotel