听力题About________carsanddogsaredestroyedeachyear.
听力题About________carsanddogsaredestroyedeachyear.
听力题Thisyear''sfederalbudgetdeficitwillbe________.
听力题Whathappenedduringtheaccident?
听力题Accordingtothepassage,whenarechildrenfirstexpectedtostudyhard?
听力题Thewomantalkstotheprofessor________.
听力题Londontaxidriversareveryefficient________.
听力题What is the main idea of the news item?
听力题Which of the following statements is TRUE?
听力题 El Salvador called Tuesday for a regional summit on ways to fight criminal youth gangs.
Salvadorean President Tony Saca said American officials of "the highest level" also would be invited to the summit on youth gangs, which Mexican President Vicente Fox called "a strategic topic and important for us."
The gangs, known as "maras," have increasingly alarmed officials in Central America, Mexico and the United States.
U.S. officials and gang investigators believe gang members from Honduras, Guatemala and El Salvador may be entering the United States more frequently because of laws targeting gang members in those countries.
Saca said the summit of Central American and Mexican leaders could be held around the end of June, but did not say where.
El Salvador called Tuesday for a regional summit on ways to fight criminal youth gangs.
Salvadorean President Tony Saca said American officials of "the highest level" also would be invited to the summit on youth gangs, which Mexican President Vicente Fox called "a strategic topic and important for us."
The gangs, known as "maras," have increasingly alarmed officials in Central America, Mexico and the United States.
U.S. officials and gang investigators believe gang members from Honduras, Guatemala and El Salvador may be entering the United States more frequently because of laws targeting gang members in those countries.
Saca said the summit of Central American and Mexican leaders could be held around the end of June, but did not say where.
听力题Themuseumwasbuiltinmemoryofthose
听力题In the United States
听力题Whatistheprobablerelationshipbetweenthetwospeakers?
听力题WhowasSandraBayley?
听力题Thenewsitemreporteda(n)_________.
听力题M: I''m really shocked at the air quality of the inland valley. Look at it.
W: Yes, over the last few decades there has been an enormous emphasis on development with hardly any concern for the environmental consequences.
M: I can certainly see the problems it has caused. I remember watching the stars at night as a child; it was so bright and beautiful. What do you think caused all of this?
W: It wasn''t one single source like a power plant or some large industry. I''m sure there were a number of contributing factors. I bet cars were one of the major causes of damage, though.
M: I remember now. Haven''t I heard something about high levels of nitrous oxides emitted from cars?
W: Precisely. There are too many nitrous oxides coming out of cars. Anytime something is burned in the atmosphere at high temperature, it causes the nitrogen in the air to combine with oxygen—forming nitrous oxide radicals. Radicals are combinations of elements that behave as if they were a single element. Nitrous oxides also tend to be rather heavy.
M: Well, what''s wrong with that?
W: When heavy gasses are released, they don''t float away and mix with the atmosphere, they hover above the area in which they are produced causing the air to stagnate. Eventually other pollutants such as dust and soot are also mixed into the air, and a big brown cloud hangs over the city.
M: Oh, I see. Then as a result of all the trapped particles, the air becomes ugly, and it is difficult to see very far.
W: Not only that, the nitrous oxides themselves are dangerous. Nitrous oxide radicals are highly active. They cause damage to concrete, and they are believed to create many health problems. Some people even say that certain forms of cancer may be developed from living in areas with high levels of nitrous oxides.
M: I''m really shocked at the air quality of the inland valley. Look at it.
W: Yes, over the last few decades there has been an enormous emphasis on development with hardly any concern for the environmental consequences.
M: I can certainly see the problems it has caused. I remember watching the stars at night as a child; it was so bright and beautiful. What do you think caused all of this?
W: It wasn''t one single source like a power plant or some large industry. I''m sure there were a number of contributing factors. I bet cars were one of the major causes of damage, though.
M: I remember now. Haven''t I heard something about high levels of nitrous oxides emitted from cars?
W: Precisely. There are too many nitrous oxides coming out of cars. Anytime something is burned in the atmosphere at high temperature, it causes the nitrogen in the air to combine with oxygen—forming nitrous oxide radicals. Radicals are combinations of elements that behave as if they were a single element. Nitrous oxides also tend to be rather heavy.
M: Well, what''s wrong with that?
W: When heavy gasses are released, they don''t float away and mix with the atmosphere, they hover above the area in which they are produced causing the air to stagnate. Eventually other pollutants such as dust and soot are also mixed into the air, and a big brown cloud hangs over the city.
M: Oh, I see. Then as a result of all the trapped particles, the air becomes ugly, and it is difficult to see very far.
W: Not only that, the nitrous oxides themselves are dangerous. Nitrous oxide radicals are highly active. They cause damage to concrete, and they are believed to create many health problems. Some people even say that certain forms of cancer may be developed from living in areas with high levels of nitrous oxides.
听力题Themanlosehistemper________.
听力题What is the news mainly about?
听力题W: Sit down please, Mr. Johnson.
M: Thank you
听力题About________carsanddogsaredestroyedeachyear.