Those strawberry growers in Miller County who last year treated their strawberry fields with a certain fungicide report that this year strawberry plants will not grow in the treated fields. Yet, since crop failures have also occurred this year in adjacent, untreated fields, it is obvious that the fungicide is not responsible for this disaster.
Which of the following, if true, most seriously weakens the argument above?
Within weeks after spraying, the fungicide breaks down into a number of simple compounds that have no antifungal effect. The fungicide is normally sprayed on fields only toward the end of the growing season after the straw- berries have begun to ripen. Farmers in Miller County who last year used a fungicide chemically similar to that used on the affected strawberry fields have reported no significant crop losses this year. The crop failures in the adjacent, untreated fields were as serious as those that occurred in the treated fields. After being sprayed on crops, the fungicide travels easily through irrigation systems from field to field.
A. 杀菌剂喷洒过几周内，逐渐分解为许多无杀菌作用的简单化合物。 B. (告诉了何时喷洒农药) C. Miller县一些农民去年用的杀菌剂与上面提到的杀菌剂相似，但其报告说今年并未出 现严重的农业欠收。 （说明杀菌剂的确不是欠收的原因，起到支持作用） D. (两者一样严重) E. 喷洒过杀菌剂后，这些杀菌剂顺着灌溉通道，很容易地从一块地流入另一块地。 (两块地相关, 反对了论据)
During a single hour, an automatic camera photographed 100 vehicles that were speeding on a one-way road, and police a mile farther down the road photographed 49 vehicles that were speeding. Since every vehicle that passed the automatic camera also passed the police during the hour, the police photographed fewer than half of the vehicles that were speeding when passing them.
Which of the following is an assumption on which the reasoning in the argument above depends?
Fewer than half of the vehicles that were speeding when they passed the police were already speeding when they passed the automatic camera. Drivers who are not exceeding the speed limit are less likely than drivers who are speeding to reduce their driving speed when they see a marked police car. Most of the vehicles that were speeding when they passed the automatic camera were still speeding when they passed the police. More than 100 vehicles passed the automatic camera during the hour in which the automatic camera photographed 100 speeding vehicles. No more than 100 vehicles drove past the police during the hour in which the police photographed 49 speeding vehicles.
