填空题

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hourglass。
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whose：that：(改whose为that)。“marriage is the only socially acceptable state 并非修饰 the single person”的定语从句，而是引导remind的宾语从句：remind sb. that…。
单项选择题
A．Sunglasses block out only a limited amount of the sun’ s ultraviolet rays that can damage the eye.B．Sunglasses can only filter harmful rays during total solar eclipses at their greatest magnitude.C．Sunglasses tend to cause the center of the eye to enlarge allowing in more intense light.D．Sunglasses should be used when any part of the sun is visibl
A．Sunglasses block out only a limited amount of the sun’ s ultraviolet rays that can damage the eye.
B．Sunglasses can only filter harmful rays during total solar eclipses at their greatest magnitude.
C．Sunglasses tend to cause the center of the eye to enlarge allowing in more intense light.
D．Sunglasses should be used when any part of the sun is visibl
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