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刷刷题刷刷变学霸
举一反三
【单选题】Every year more than half a million American kids have drainage(排泄) tubes surgically implanted in their ears to combat persistent infections. The procedure, known as tympanostomy, may not be as (62) a...
A.
[A] feeling [C] health
B.
[B] hearing [D] memory
【单选题】Section BDirections: There are 2 passages in this section．Each passage is followed by some questions or unfinished statements．For each of them there are four choices marked A, B, C and D．You should de...
A.
could not easily be absorbed by the human body
B.
were potentially harmful to people's health
C.
were too expensive for daily consumption
D.
could not provide any cure for vitamin deficiencies
【单选题】人体内细胞内嘌呤核苷酸分解生成的尿酸()。
A.
约占人体日尿酸生成量的20%
B.
约占人体日尿酸生成量的40%
C.
约占人体日尿酸生成量的60%
D.
约占人体日尿酸生成量的80%
E.
约占人体日尿酸生成量的100%