单项选择题

Questions 27-30

A．Tree care.
B．Throwing a rope over the branches of a tree.
C．Getting into a harness.
D．Rescuing pets.
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单项选择题
A．The Walnut Tree.B．The Europa Hotel.C．The Maltravers.D．Undecided.
A．The Walnut Tree.
B．The Europa Hotel.
C．The Maltravers.
D．Undecided.
单项选择题
The article was written to explain ______.
A．the greenhouse effect
B．the solar effects on the earth
C．the models of solar-weather interactions
D．the causes affecting weather
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