单项选择题

A．The ultra-violet rays become stronger
B．The ozone layer is expanding
C．Many people buy low-.price sunglasses
D．More people go to the solarium to get tanned
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单项选择题
A．eye disease suffererB．eye doctorC．cheap product sellerD．sunglasses seller
A．eye disease sufferer
B．eye doctor
C．cheap product seller
D．sunglasses seller
单项选择题
Canada comprises ______ provinces and three territories.
A．15
B．8
C．10C. 28
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