She to school by bus every day.[ ] A. g

一种新的酒后驾车人员体内酒精含量的检测装置如右图所示，下列说法不正确的是

A．该检测装置实现了将化学能转化了电能，且单位时间内通过电量越大，酒精含量越高

B．电极A 的反应： H₂O + C₂H₅OH－4e^- = CH₃COOH + 4H⁺

C．电极B 是正极，且反应后该电极区pH 值减小

D．电池总反应：O₂ + C₂H₅OH = CH₃COOH + H₂O

计算：﹣3ab²﹣5ab²=（     ）

采用气焊焊接中碳钢钢管三通时，要先预热到（）。

A、50～100℃

B、150～200℃

C、250～300℃

D、350～400℃

阅读理解

阅读下列短文, 根据短文内容, 从短文后的选项中选出能填入空白处的最佳选项

      __1__  To begin with, cleaner environment, enjoying the game with hundreds of sports athletes and

entertainment stars, and the opportunity of contacting people from all over the world seem exciting to the

citizens.  2__  In most cases, bidding for the Olympics is well supported by both the public and the

central government.

      Unfortunately, this is not the entire view of the pretty picture. If looking from another angle, the

Olympic bid might bring about some sideeffects to a city.

     __3__  It includes the increasing pollution of cars, more pressure on water resources, huge amount

of wasted leaflets and other materials used for public activities, which are most probably neglected. In

order to broaden the streets, some trees may have to be cut. Reduction of farmland may be caused b

y the need of setting up new sports centers or accommodation facilities. These environmental

consequences can be especially serious in a resourcelimited and crowded city in a thirdworld country.

     Besides, if not well managed and organized, the big event may not be so beneficial, and the new

facilities may be forever empty after the games.__4__

     Finally, let's think about the lowincome groups in the city.__5__ More tax, more fees, more

expensive property prices, and higher cost of living. These definitely are not good news for them.

A. Hosting the Olympics surely would bring about much gain to a city.

B. We can only benefit from it for a short time.

C. What will they get from the Olympics bidding?

D. First of all, it will bring a lot of environmental problems.

E. There are many reasons for not hosting the Olympic Games.

F. There have been cases that host cities ended up with large debts.