单选题Most of us have come to realize that it is about time (that) we ______ effective measures to prevent all kinds of pollution.

单选题 {{B}}Passage TwoQuestions 19 to 21 are based on the passage you have just beard.{{/B}}

单选题Which of these is not a possible factor leading to greater productivity?

单选题Norman Davis will be remembered by many with ______ not only as a great scholar but also as a most delightful and faithful friend.

单选题Questions 33 to 35 are based on the passage you have just heard.

单选题During your training period, it is of great importance to ______.

单选题Questions 22 to 25 are based on the passage you have just heard.

单选题Why is the Parisi Hotel suitable for old people?

单选题According to the author, languages, whether civilized or not, have the characteristics EXCEPT ______.

单选题We can infer that in El Hoyo, Chicano is a term used for ______.

单选题 Questions 23 to 25 are based on the conversation you have just heard.

单选题As high school students flock to social networking sites, campus police are scanning their Facebook and MySpace pages for tips to help break up fights, monitor gangs and prevent crime. Some students object to police looking over their shoulders. But officers responsible for school safety say routine checks of the online forums often add to the knowledge they obtain from hallways (走廊)or schoolyards. In recent years, school administrators have blamed some campus fights on Internet conflicts and urged parents to keep watch on their children"s computer activity. But students who use the Web to let their 500 closest friends know what they are doing at all times are sometimes surprised that police are watching, too. Police don"t have special privileges on Facebook or MySpace. Students who want to go unobserved can change privacy (隐私) settings so that their profiles are displayed only to a list of approved people. But the default (默认) settings leave those profiles open to many Internet users (in the case of Facebook) or all of them (in the case of MySpace). Employers and college admissions counselors have examined online profiles of student applicants for some time. Police across the country have been doing the same for the past two or three years, said Kevin Quinn, a spokesman for the Minnesota-based National Association of School Resource Officers. "If you"re already familiar with the technology, it doesn"t take you but a couple of minutes to hook into the student population and keep an eye on things," Quinn said. A journey to a thicket (丛林) of MySpace profiles found high school students discussing drugs, sex and fights. It was all publicly available (although in language that embarrassed a reporter). Late last month, Fairfax County police announced the arrests of seven Chantilly area teenagers for trying to recruit Franklin Middle School students to a gang. That investigation was aided when a student showed the school resource officer gang symbols littering one of the suspect"s MySpace profiles. Fairfax police say they pride themselves on addressing issues in schools before they develop into major problems. Keeping an eye on Facebook and MySpace has become an extra tool in that effort, they said.

单选题If a serious accident occurs on a motorway, the drivers ______