单项选择题

A．are less sensitive
B．open and close more quickly
C．take in more rays
D．filter out ultra-violet rays less sufficiently
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单项选择题
A．peace negotiations with GreeceB．land dispute with GreeceC．land development on a Greek islandD．his ability as a foreign minister
A．peace negotiations with Greece
B．land dispute with Greece
C．land development on a Greek island
D．his ability as a foreign minister
单项选择题
A．The ultra-violet rays become strongerB．The ozone layer is expandingC．Many people buy low-.price sunglassesD．More people go to the solarium to get tanned
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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