皮皮学，免费搜题
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【单选题】
His name has ________ at every selection meeting this season.A.
stayed up
B.
cropped up
C.
covered up
D.
broken out
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皮皮学刷刷变学霸
举一反三
【单选题】English is considered as a(n) _____ language, and it is no surprise that there are so many people in the world learning it. [ ]
A.
universal
B.
logical
C.
artificial
D.
regular
【简答题】举出至少4种不同的肽段氨基酸序列的测定方法。
【简答题】按_____划分，导游员分为海外领队、全程陪同导游员、地方陪同导游员和景点景区导游员。