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【单选题】
关于自感现象,下列说法中正确的是( )A.
对于同一线圈，通过它的电流越大，线圈中产生的自感电动势越大
B.
对于同一线圈，通过它的磁通量越大，线圈中产生的自感电动势越大
C.
对于同一线圈，当电流变化越大时，线圈中产生的自感电动势越大
D.
对于同一线圈，当电流变化越快时，线圈中产生的自感电动势越大
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【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
【简答题】That night Porter read through company literature and discovered the
【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
【单选题】听力原文： Good evening, ladies and gentlemen. This is your re porter, Erin Brown, with the latest news about the oil spill at Seaview Beach. When volunteers were asked to come and help clean up the oil, a...
A.
A specialist in oil-spill prevention.
B.
A TV reporter.
C.
An oil company technician.
D.
The head of the oil company.
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