According to the passage, the aging process is a struggle between
A．destruction and repair.
B．damage and control.
C．control and reverse.
D．repair and reverse.

判断题护面墙除承受自重外，不能承受墙背土压力。()

未分类题The author uses the result of Gallup poll to argue thatA．the first ladies in America are respected by the whole nation.B．Rosalynn is not as good as Nancy Reagan in the 1980s.C．Gallup poll is an effective organization to collect public opinions.D．today's famous people are created for their well-knowness.

判断题励磁绕组断线的他励直流电动机，额定负载起动时，将出现电流过大情况。()

未分类题The phrase 'putting their heads together'(Lines 7-8, Paragraph 3)meansA．making efforts collectively.B．always getting together.C．thinking in the same way.D．chatting together.

判断题三相异步电动机根据转子结构的不同，分为笼型异步电动机和绕线型异步电动机。()

未分类题According to Brand, older workers suffered less than young laid-off workers becauseA．young workers feel more humiliated at being laid off than older people.B．older workers want to retire earlier to enjoy their life.C．young workers cannot get used to the life after being laid off.D．older workers do not worry about their retirement life after being laid off.

判断题同一台异步电动机，用三角形接法起动和用星型接法起动相比，前者的起动电流(线电流)是后者的3倍;前者的起动转矩是后者的3倍。()

判断题一台380V、50Hz的感应电动机，把它接在380V、60Hz的电源上运行，则电机的主磁通将下降;电机的最大转矩将下降。()

未分类题Why does the system fail to arrest a wanted person?A．The system is not effective in recognizing people.B．The system does not look at skin color or one's gender.C．The system does not consider people's specific features.D．The system is highly inaccurate and can be easily fooled.

判断题在最佳含水量下路基压实后，其水稳定性最佳。()

未分类题What is the ACLUs attitude toward the system?

未分类题The probable title of this passage isA．Multifunction of Mobile Phones.B．A Rising Industry—Text Messages.C．Ads in Text Messages.D．Should We Stop Text Message Ads?

未分类题The author cites the example of the 16-year-old Albanian high-school drop-out to showA．the extreme poverty of his country.B．the terrible picture of illegal migration.C．the strong desire of poor people to leave for rich countries.D．the difficulty in a long cross-border journey.

未分类题The word 'conversation'(Line 8, Paragraph 4)probably implies thatA．advertisers need to talk to teenagers.B．all brands can improve through chatting with consumers.C．consumers have their rights to avoid advertisements' interference.D．a survey should be carried out before products are launched.

未分类题According to the passage, we can infer thatA．teenagers sometimes are promotion targets.B．many people don't want to be bothered by ads.C．teens can get a free sample by sending a text message.D．text message advertisement serves as a lure for teenagers.