单项选择题


A．break
B．holiday
C．interval
D．course
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单项选择题
A．andB．butC．unlessD．since
A．and
B．but
C．unless
D．since
单项选择题
The author's purpose of writing this passage is to ______.
A．alert readers to the scarcity of natural resources
B．call for more research on the influence of geographical environment
C．introduce different elements in character cultivation
D．draw more attention to the health condition of mankind
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