逻辑求解

instinctwu

134. The more television children watch, the less competent they are in mathematical knowledge. More than a third of children in the United States watch television for more than five hours a day; in South Korea
the figure is only 7 percent. But whereas less than 15 percent of children in the United States understand advanced measurement and geometric concepts, 40 percent of South Korean children are competent in these areas. Therefore, if United States children are to do well in mathematics, they must watch less television.

Which one of the following is an assumption upon in advanced measurement and geometric concepts than are South Korean children?


A.Children in the United States are less interested in advanced measurement and geometric concepts than are South Korean children.
B.South Korean children are more disciplined about doing schoolwork than are
C.Children who want to do well in advanced measurement and geometry will watch less television.
D.A child’s ability in advanced measurement and geometry increases if he or she watches less than one hour of television a day.
E.The instruction in advanced measurement and geometric concepts available to children in the United States is not substantially worse than that available to South Korean children.

选E没争议。如果D是说less than five hours，那能选么

instinctwu

恩，我想的就是那个意思

haoyuejayer

个人理解，如果D改成楼主说的5小时的话，对D取非，南韩看电视超过5小时的人数比美国少，符合事实，反之不符合。不过如果D真的变成5小时的话，个人感觉E还是作为assumption成立的，因为对E取非的话，geometric concepts的好坏还是能左右事实的成立。这样一来可能有2个assumption出现，因此才改成1小时，为了避免误导吧，可能。