21. The town of Greenfield recently instituted a substantial supplementary tax on all households, whereby each household is taxed in proportion to the volume of the trash that it puts out for trash collectors to pick up, as measured by the number of standard-sized garbage bags put out. In order to reduce the volume of the trash on which their tax bill is based, Greenfield households can deliver their recyclable trash to a conveniently located local commercial recycling center, where such trash is accepted free of charge.
The supplementary tax provides some financial incentive to Greenfield households to do each of the following EXCEPT
(A) sort out recyclable trash thoroughly from their other trash
(B) dump nonrecyclable trash illegally at parks and roadsides
(C) compress and nest items of nonrecyclable trash before putting them out for pickup
(D) deliver recyclable materials to the recycling center instead of passing them on to neighbors who want to reuse them（D）
(E) buy products without packaging or with recyclable rather than nonrecyclable packaging
WHY B IS OK? ANSWER IS D.
25. Unless negotiations begin soon, the cease-fire will be violated by one of the two sides to the dispute. Negotiations will be held only if other countries have pressured the two sides to negotiate; an agreement will emerge only if other countries continue such pressure throughout the negotiations. But no negotiations will be held until international troops enforcing the cease-fire have demonstrated their ability to counter any aggression from either side, thus suppressing a major incentive for the two sides to resume fighting.
If the statements above are true, and if negotiations between the two sides do begin soon, at the time those negotiations begin each of the following must also be true EXCEPT:
(A) The cease-fire has not been violated by either of the two sides.
(B) International troops enforcing the cease-fire have demonstrated that they can counter aggression from either of the two sides.
(C) A major incentive for the two sides to resume hostilities has been suppressed.
(D) Other countries have exerted pressure on the two sides to the dispute
(E) The negotiations’ reaching an agreement depends in part on the actions of other countries.
WHY E IS OK?.ANSWER IS A.
I don't understand what you mean by saying the above.
For question 21, the answer is D because it is talking about the financial incentive.
For question 25, the answer is A because it is talking about what must be true: the negotiation is necessary for the cease-fire to happen, but it is not sufficient to guarantee it happen.
继续求教.
我的问题是：
21. ANSWER IS D. how about B?
In order to reduce the volume of the trash on which their tax bill is based, Greenfield households can deliver their recyclable trash to a conveniently located local commercial recycling center, where such trash is accepted free of charge.这句话不是说deliver their recyclable trash to a conveniently located local commercial recycling center是free的吗，所以为了省钱，D的选择也是 financial incentive。请指教。
继续求教.
我的问题是：
21. ANSWER IS D. how about B?
In order to reduce the volume of the trash on which their tax bill is based, Greenfield households can deliver their recyclable trash to a conveniently located local commercial recycling center, where such trash is accepted free of charge.这句话不是说deliver their recyclable trash to a conveniently located local commercial recycling center是free的吗，所以为了省钱，D的选择也是 financial incentive。请指教。
still don't understand your question here.
B is not right because
dumping nonrecyclable trash illegally at parks and roadsides can lead to heavy fine from the government. Hence, finanical incentive is also considered here.
mbz，非常感谢你的回复。可能我有点陷在21题了。
我的意思是B选项对我有很大的迷惑性。
（D） deliver recyclable materials to the recycling center instead of passing them on to neighbors who want to reuse them
是不是finanical incentive不会让人们选择deliver recyclable materials to the recycling center 而不选择passing them on to neighbors。
若D选项改为（D） deliver recyclable materials to the recycling center ，这应该是finanical incentive的结果吧。因为把recyclable materials 放在家门口是要收费的，而送到recycling center 则不收费。
请指教！谢谢。
若D选项改为（D） deliver recyclable materials to the recycling center ，这应该是finanical incentive的结果吧。因为把recyclable materials 放在家门口是要收费的，而送到recycling center 则不收费。
your understanding above is correct.
As for the the original choice D, (D) deliver recyclable materials to the recycling center instead of passing them on to neighbors who want to reuse them
It doesn't make any difference in terms of financial consideration b/c either way you don't have to pay for the handling of the recyclable materials. So no financial incentive is involved here.
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