单选题Students should know better not______pets like dogs, cats and mice at dormitory.

单选题Trains used to stop here to ______ us.

单选题According to the author, probably no one uses the old Excel macro language, because it ______. A．is out of date B．is a nasty process C．is a long process D．all of the above

单选题They are ______ the same size, though ______ different colour.

单选题The time during which the desired sector rotates to access mechanism is called ______. A．rotational delay B．access time C．run time D．seek time

单选题Are you interested ______ tennis?A. in playingB. for playingC. on playingD. to play

单选题To save more money you'll need to be more frugal.

单选题______ is known to us is that tobacco contains nicotine and other harmful products, so you should give up smoking.

单选题He kept silent, so I couldn't know ______ he agreed ______ not. A. if; or B. whether; or C. either; or D. neither; nor

单选题[此试题无题干]

单选题Despite his______appearance, he was chosen by his employer for a job that required neatness and polish.

单选题When I was still an architecture student, a teacher told me, "We learn more from buildings that fall down than from buildings that stand up." What he meant was that construction is as much the result of experience as of theory. Although structural design follows established formulas, the actual performance of a building is complicated by the passage of time, the behavior of users, the natural elements--and unnatural events. All are difficult to simulate. Buildings, unlike cars, can't be crash-tested. The first important lesson of the World Trade Center collapse is that tall buildings can withstand the impact of a large jetliner. The twin towers were supported by 59 perimeter columns on each side. Although about 30 of these columns, extending from four to six floors, were destroyed in each building by the impact, initially both towers remained standing. Even so, the death toll (代价) was about-2 245 people lost their lives. I was once asked, how tall buildings should be designed given what we'd learned from the World Trade Center collapse. My answer was, "Lower." The question of when a tall building becomes unsafe is easy to answer. Common aerial fire-fighting ladders in use today are 100 feet high and can reach to about the 10th floor; So fires in buildings up to 10 stories high can be fought from the exterior (外部). Fighting fires and evacuating occupants above that height depend on fire stairs. The taller the building, the longer it will take for firefighters to climb to the scene of the fire. So the simple answer to the safety question is "Lower than 10 stories." Then why don't cities impose lower height limits? A 60-story office building does not have six times as much rentable space as a 10-story building. However, all things being equal, such a building will produce four times more revenue and four times more in property taxes. So cutting building heights would mean cutting city budgets. The most important lesson of the World Trade Center collapse is not that we should stop building tall buildings but that we have misjudged their cost. We did the same thing when we underestimated the cost of hurtling along a highway in a steel box at 70 miles per hour. It took many years before seat belts, air hags, radial tires, and antilock brakes became commonplace. At first, cars simply were too slow to warrant concern. Later, manufacturers resisted these expensive devices, arguing that consumers would not pay for safety. Now we do-- willingly.

单选题The article does not mention whether the scientists' experiments with dogs have ______.

单选题Two (woman) teachers and four (girl) students (were) praised (at) the meeting yesterday. A. woman B. girl C. were D. at

单选题In the second paragraph the writer mainly discusses ______

单选题I think this is the first time that we have met．______ anywhere．A．Before have we never seen each otherB．Never before we have seen each otherC．Each other have We seen never beforeD．Never before have we seen each other

单选题Parties are therefore free to strive for a settlement without {{U}}jeopardizing{{/U}} their chances for or in a trim if mediation is unsuccessful.

单选题Mrs. James______a divorce from her husband, for she can no longer______ his stormy temper.(北京大学2005年试题)