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【单选题】
关于肝炎的描述,下列那错误的?A.
是一种缺陷病毒
B.
其基因组是已知动物病毒中最小
C.
传染途径与HBV相同
D.
其感染常导致乙肝患者症状加重与恶化
E.
其免疫原性弱，通常机体不产生其相应抗体
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举一反三
【单选题】U.S. News ________ ranking of colleges since 1983. They are a very popular resource for students looking to apply to university campus.
A.
maintains
B.
is maintaining
C.
maintained
D.
has been maintaining
【简答题】Prepositions of time: this type of preposition differs between one point in time (e.g. on, at, and in) and extended time (e.g. since, for, by, from-to, from-until, during, and (with)in). Fill in the m...
【单选题】Speaking of the scoring for the ranking published by U.S. News & World Report, which item weighs most?
A.
peer assessment
B.
alumni donation
C.
faculty resources
D.
student retention
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