单项选择题

The speed at which an animal lives is determined by（）the rate at which it uses oxygen.

A. measuring
B. assessing
C. surveying
D. pleasing

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In the distance they saw a（）house.

A. little old grey
B. grey old little C. old little grey
D. old grey little
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Mr. Green drove slowly on the way home until he reached the high way,（）the speed limit was 60 miles per hour.

A. because
B. which
C. where
D. that
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