单项选择题

Jason is usually under the weather, but his robust brother ______.

[A] is rarely
[B] is scarcely
[C] hardly is
[D] rarely is
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单项选择题
The incredible precision of the equipment is ______ to the mechanical skill of the engineers who built it.
[A] testimony
[B] symbol
[C] evidence
[D] attribute
单项选择题
This type of apparatus can produce more than 40,000 blood ______ a day.
[A] examples
[B] models
[C] samples
[D] specimen
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