OG 蓝本 37

一只追梦的猫

which of the following most logically completes the argument?
Although the pesticide TDX has been widely used by fruit growers since the early 1960s, a regulation in force since 1960 has prohibited sale of fruit on which any TDX residue can be detected.That regulation is about to be replaced by one that allows sale of fruit on which trace amount of TDX residue are detected.In fact, however, the change will not allow more TDX on fruit than was allowed in hte 1960s, because________.

A.pre-1970 techniques for detecting TDX residue could detect it only when it was prsent on friut in more than the trace amounts allowed by the new regulations.

B.many more people today than in the 1960s habitually purchase and eat fruit without making an effort to clean redidue off the fruit.

C.people today do not individually consume any more pieces if fruit, on average, than did the peolpe in the 1960s.

D.at least a small fraction of the fruit sold each year since the early 1960s has had on it greater levels of  TDX than the regulations allows.

E.the presence of TDX on fruit in greater than trace amounts has not been shown to cause any harm even to children who eat large amounts of fruit.

答案是：A
书上讲得我绕来绕去的，谁给我简化一下，谢谢

sdcar2010

It's a math problem with reading comprehension as a means.

Premise: In 1960's, fruit found with TDX on it will not be on sale.

The conclusion says the the new regulation (to allow certain fruit with TDX level lower than a standard to be on sale)  would not allow more TDX on fruit than allowed in 1960's.

The reason? In 1960's, the level of TDX can be detected on the fruit is higher than the standard chosen by the new regulation. In other words, fruits having the amount of TDX lower than the standard had already been on sale in 1960's. You just could not tell by the OLD testing method.