单项选择题

A．They cannot protect the eyes when the sun is strong.
B．They can be used as fashionable toys for kids.
C．They are all fashionable.
D．They do not effectively filter out harmful rays.
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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．are less sensitiveB．open and close more quicklyC．take in more raysD．filter out ultra-violet rays less sufficiently
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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