单选题Prices reach equilibrium at the level at which quantity demanded ______ quantity supplied.

单选题 The teacher explained the new lesson ______ to the students.

单选题Let"s not ______ over such a trifle!

单选题Only when (he realized) that there (would be) more (difficulties) ahead than he expected (he came to) me for help.A. he realizedB. would beC. difficultiesD. he came to

单选题My boss has always attended to the ______ of important business himself.

单选题The phrase "back off" in boldface in this contest probably means ______.

单选题Husband: Shall I get something for dinner tonight, dear? I may drop over at the supermarket on my way back home. Wife: Oh, yes. I appreciate it. ______ A. Why don't you get some meat? B. Could you get me some eggs in the fridge? C. It's nice of you to fix dinner. D. I'd like a chicken burger, please.

单选题Come earlier next time; ______ you'll be punished.

单选题In the course of a day students do far more than just ______ classes. A. attend B. attended C. to attend D. attending

单选题Small. moments sometimes ______a very long time.

单选题It is______from my school to the railway station.

单选题Today more and more people go to websites when looking for information. Although most readers go to websites for news and e-mail, a form of person-to-person news, or in the form of chatting, they also read books on the web. It's called electronic book (e-book). Electronic books could revolutionize reading, but people ought to consider their far-reaching impacts as well. "The e-book promises to cause a slow tragedy on life as we know it," Jason Ohler, professor of technology assessment, university of Alaska Southeast In Juneau, warned the World Future Society, Bethesda, Md. His assessment weighed the pros and cons (赞成和反对的理由) of e-book technology's impact on social relationships, the environment, the economy, etc. Before you curl up (蜷曲) with an e-book, consider the disadvantages. They increase eyestrain due to poor screen resolution, replace a relatively cheap commodity with a more expensive one, and displace workers in print-book production and traditional publishing. E-books make it easy to share data, thereby threatening copyright agreements and reducing compensation (补偿) of authors, as well as creating nonbiodegradable (不可生物降解的) trash. On the other hand, e-books save paper and trees, reduce the burden of the carrying and storing of printed books, promote self-sufficiency in learning, and make reading a collaborative experience online. They also create new jobs for writers and artists and encourage self-publishing. In final analysis, Ohler points out, e-books should gain society's approval if a few conditions are met: make them biodegradable and recyclable, solve the problem of eye fatigue, be sure the "have-nots" get the technology, and support e-book training in schools and business.

单选题After several ______ attempts to send the missile into space, the spacecraft was finally launched successfully.

单选题If Dorothy had not been badly hurt in a car accident, ______ in last month's marathon race.

单选题It is an interesting ______ that Robson can say that he would not use gamesmanship, but felt that the professional foul was not only a legitimate weapon in a given situation but also his responsibility.

单选题The combination of ______ and emotional interactions with infants is crucial to their learning and emotional development.

单选题Is Mary ______ to join us?

单选题 The directors would ______ the key issue on Friday morning, as they searched for a legally binding agreement.

单选题Successful leaders ______ events rather than react to them.