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20. In

Brazil

, side-by-side comparisons of Africanized honeybees and the native honeybees have shown that the Africanized bees are far superior honey producers. Therefore, there is no reason to fear that domestic commercial honey production will decline in the

United States

if local honeybees are displaced by Africanized honeybees.

Each of the following, if true, would weaken the argument EXCEPT:

(A) The honeybees native to Brazil are not of the same variety as those most frequently used in the commercial beekeeping industry in the United States.

(B) Commercial honey production is far more complicated and expensive with Africanized honeybees than it is with the more docile honeybees common in the

United States

.

(C) If Africanized honeybees replace local honeybees, certain types of ornamental trees will be less effectively pollinated.

(D) In the

United States

a significant proportion of the commercial honey supply comes from hobby beekeepers, many of whom are likely to abandon beekeeping with the influx of Africanized bees.

这道题答案是c吗？可我觉得如果树不传粉，当然没有花，哪来的密让蜜蜂采呢？所以c因该削弱阿，黄皮书上答案是b,我觉得这几个选项都可以削弱啊？请指教！！！

(E) The area of Brazil where the comparative study was done is far better suited to the foraging habits of the Africanized honeybees than are most areas of the

United States

(E) The area of Brazil where the comparative study was done is far better suited to the foraging habits of the Africanized honeybees than are most areas of the

United States

(B) Commercial honey production is far more complicated and expensive with Africanized honeybees than it is with the more docile honeybees common in the United States.

(C) If Africanized honeybees replace local honeybees, certain types of ornamental trees will be less effectively pollinated.

C若是要削弱，必須補上一句，此樹（certain types of ornamental trees）是非洲蜜蜂的主食、花蜜來源。否則隨便一種花怎麼了，關他們啥事？NN再想想，依據生物常識，蜜蜂常吃的花蜜，就是他們常常幫助授粉的對象，那麼非洲蜂若是取代本地蜂，此樹少了授粉，看來這樹應是本地蜂的主食才是。不過不建議NN依照常識判斷，否則會加入自己的想法影響答題，只要前半段就足夠了。

B很明確是削弱，因為製造非洲蜂的蜂蜜複雜耗本，若以牠代替本地蜂，蜂農可要擔心成本，可不會have no fear了吧。

Premise: In

Brazil

, side-by-side comparisons of Africanized honeybees and the native honeybees have shown that the Africanized bees are far superior honey producers. Conclusion: Therefore, there is no reason to fear that domestic commercial honey production will decline in the

United States

if local honeybees are displaced by Africanized honeybees.

以下是引用iversonalex在2007-2-14 14:25:00的发言：

这道题答案是c吗？可我觉得如果树不传粉，当然没有花，哪来的密让蜜蜂采呢？所以c因该削弱阿，黄皮书上答案是b,我觉得这几个选项都可以削弱啊？请指教！！！Each of the following, if true, would weaken the argument EXCEPT: