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【单选题】
门静脉高压症大出血的特点为A.
发生急，来势猛，一般不引起休克
B.
发生急，出血量大
C.
右上腹绞痛后黑便
D.
剧烈呕吐，呕血及黑便
E.
只有便血，无呕血
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举一反三
【判断题】That night Porter read through company literature and discovered the products were guaranteed
A.
正确
B.
错误
【单选题】下列农药残留危害的说法中,错误的是
A.
有机磷农药有迟发性神经毒性
B.
氨基甲酸酯类农药是可逆性胆碱酯酶抑制剂
C.
拟除虫菊酯属于中等毒或低毒
D.
除草剂在农作物的收获期使用，危害性较大
E.
多种农药混配使用可提高药效，延缓昆虫和杂草产生抗药性，但有时可使毒性增强
【单选题】Night-shift workers are those who ______．
A.
have to pay on their internal clock
B.
need to re-adjust their clock
C.
fall asleep late at night
D.
have to work at night
【单选题】If you’re sitting around a lonely campfire at night, the howl of a wolf can sound pretty ______.
A.
fearful
B.
threatening
C.
dreadful
D.
frightening
【单选题】We're talking about the piano and the pianist _____ were in the concert we attended last night. [ ]
A.
which
B.
whom
C.
who
D.
that
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