单项选择题

London taxi drivers are very efficient________.

A．because they have a driving license
B．because they have received special training
C．because the traffic conditions in London are good
D．because the traffic system of the city is not very complex

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问答题

DISAPPEARING FORESTSThe world’s forests are disappearing. As much as a third of the total tree cover has been lost since agriculture began some A0,000 years ago. The remaining forests are home to half of the world species, thus becoming the chief resource for their survival. Tropical rain forests once covered AB% of the land of the planet as well as supporting at least half of the world species of plants and animals. These rain forests are home to millions of people, but there are other demands on them. For example, much has been cut for timber, and an increasing amount of forestland has been used for industrial purposes or for agricultural development, such as crop glowing. By the AII0s, less than half of the earth’s original rain forests remained, and they continue to disappear at an alarming rate every year. As a result, the world’s forests are now facing a gradual extinction.

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