单项选择题


A．and
B．but
C．unless
D．since
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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
单项选择题
It can be inferred that proper amounts of iodine, fluoride and calcium can ______.
A．benefit people's physical health
B．influence the quality of water supply
C．help provide breeding places for pests
D．strengthen a person's character
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