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【单选题】
According to the regulations of airport security check, how many pieces of cosmetics is allowed to be carried by each passenger?A.
one
B.
two
C.
three
D.
none
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【单选题】Bracken, a poisonous weed, is spreading and damaging much pastureland in the Northern Hemisphere. One potentially inexpensive and self-sustaining countermeasure is to introduce natural enemies of the ...
A.
That bracken in the Northern Hemisphere grows in approximately the same climates and soil conditions in which it grows in the Southern Hemisphere.
B.
That the released moths will feed on weeds other than bracken that are native to the Northern Hemisphere.
C.
That the livestock that will return to pastures now lost to bracken will develop immunities to the diseases caused by bracken.
D.
That the released moths will survive in sufficient numbers to build a population large enough to reduce bracken and retard its growth.
E.
That traditional methods of control, such as burning, cutting, and chemical spraying, will not become less expensive or labor-intensive than they are now.
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