单项选择题

A．There’s much to do besides work and study.
B．It’s convenient for people to go anywhere.
C．The natural environment is beneficial to children.
D．The countryside is a perfect place for weekends.
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单项选择题
A．People without exposure to sunlight.B．Wealthy people in Europe centuries ago.C．Workers during the Industrial Revolution.D．Wealthy people during the Industrial Revolution.
A．People without exposure to sunlight.
B．Wealthy people in Europe centuries ago.
C．Workers during the Industrial Revolution.
D．Wealthy people during the Industrial Revolution.
填空题
Epiphytes, which form much of the under story of the rainforest, get all their water and nutrients from______.
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