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【单选题】
下肢深静脉倒流性疾病主要是指:A.
原发性下肢深静脉瓣膜功能不下肢单纯静脉曲张
B.
下肢深静脉血栓形成后遗症
C.
下腔静脉梗阻
D.
下肢血栓性静脉炎
E.
下腔静脉及肝静脉梗阻
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皮皮学刷刷变学霸
举一反三
【单选题】'People from the ancient world sailed around Africa. They even reached America.' In your opinion, how would the writer of the passage feel about these ideas?
A.
He has used this as an important fact to praise ancient civilization.
B.
He does not believe them.
C.
In his opinion, ancient explorers did not have the skills necessary for long journeys.
D.
In his opinion, they are possible.
【单选题】The explorers sailed on the ocean for two weeks and ________ found the mysterious land.
A.
generally
B.
eventually
C.
extremely
D.
gradually
【判断题】Early explorers sailed aimless on the sea and discovered new lands by luck.
A.
正确
B.
错误
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