单项选择题

Which of the following words can replace the word "as" in the second paragraph

A．which
B．that
C．when
D．while
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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
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
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