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【单选题】
下列说法正确的是（ ）A.
一个角的余角一定小于这个角
B.
一个锐角的余角一定是锐角
C.
一个角的补角一定是钝角
D.
一个角的补角一定大于这个角
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举一反三
【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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