单项选择题

A．They will act like tiny clouds.B．They will decrease t……

Questions 9 and 10 are based on the following news. At tire end of the news item, you will be given 10 seconds to answer each of the two questions. Now listen to the news.What effect will the trails of aircrafts produce in the nighttime

A．They will act like tiny clouds.
B．They will decrease temperatures.
C．They will account for greenhouse effect.
D．They will increase precipitation.

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热门试题

单项选择题The discovery of a new type of ceratopsian dinosaur suggests ceratopsians______.

A．migrated to North America around 70—80 million years ago______.
B．arrived in Asia from North America about 90 million years ago
C．originated in Asia and later migrated to North America
D．could have moved to Asia from North America long ago

单项选择题The primary purpose of the second paragraph is which of the following

A．To show that Augustan Rome and fifth-century Athens are examples of cultural, economic, and military expansion against which all subsequent cases must be measured.
B．To suggest that cultural, economic, and military advances have tended to be closely interrelated in different societies.
C．To argue that, while the revivals of Augustan Rome and fifth-century Athens were similar, they are unrelated to other historical examples.
D．To indicate that, wherever possible, historians should seek to make comparisons with the earliest chronological examples of revival.

填空题any—any other

单项选择题The ecological disaster of Chechnya is caused by______.

A．thriving and planned oil industry
B．years of separatist warfare
C．pollution of major rivers
D．growing number of babies born

单项选择题The reasons why Dr. Mathew says younger people in Britain are radical do NOT include

A．younger people in Britain dress different from those in America
B．many young men in Britain wear earrings in one of their ears
C．most younger people in Britain have more political awareness than those in America
D．many young men in Britain are fans of Madonna