单项选择题

The passage mainly discusses ______.

A．large-scale deforestation and the climate changes
B．ecosystems in the eastern lowlands
C．the cloud forests of Monterverde
D．Caribbean winds
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单项选择题
The only remaining 18% of Costa Rican lowland forests in the early 1990s led to ______.
A．high up pastures
B．moist air
C．a warmer atmosphere
D．clouds' condensation
单项选择题
According to the passage, the great development of Turnitin is due to ______.
A．its superb management
B．the thriving of academic cheating
C．its big electronic eye
D．the test of its software by the Joint Information Systems Committee
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