单项选择题

The invisible rays of the()beyond the violet end are called the ultraviolet rays.

A. speculation
B. spectrum
C. sleet
D. range

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单项选择题
The remarks made by Martin Perk in Paragraph 3 about Gordon Shaw could be taken as ().

A. a compliment
B. an outspoken criticism
C. an expression of jealousy
D. something a little sarcastic
单项选择题
40().

A. air
B. cloud
C. world
D. land
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