皮皮学，免费搜题
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搜题
【单选题】
人类和灵长类嘌呤代谢的终产物是A.
尿酸
B.
尿囊素
C.
尿囊酸
D.
尿素
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皮皮学刷刷变学霸
举一反三
【简答题】Meeting in progress，quiet please．
【单选题】Keep quiet, please. We're not allowed _____ much noise in the reading room. [ ]
A.
to make
B.
making
C.
to making
D.
make
【单选题】Be quiet, please. We're going to have an English test. Now I'm going to ______ your papers. [ ]
A.
give out
B.
give up
C.
give back
D.
give away