求高手阅读36套Ex22的一个短文章

jurat911

5. When a driver is suspected of having had too much to drink, testing the driver's ability to walk a straight line gives a more reliable indication of fitness to drive than does testing the driver's blood-alcohol level.

Which of the following, if true, best supports the claim made in the statement above?
(A) Not all observers will agree whether or not an individual has succeeded in walking a straight line.
(B) Because of genetic differences and variations in acquired tolerance to alcohol, some individuals suffer more serious motor impairment from a given high blood-alcohol level than do others.
(C) Tests designed to measure blood-alcohol levels are accurate, inexpensive, and easy to administer.
(D) More than half the drivers involved in fatal accidents have blood-alcohol levels that exceed the legal limit, whereas in less-serious accidents the proportion of legally intoxicated drivers is lower.
(E) Some individuals with high blood-alcohol levels are capable of walking a straight line but are not capable of driving safely.


我实在搞不清，B和D的区别在哪儿？？为什么D不对.......求高手

小桥依梦

D支持了第二种检验方法，既然血液中酒精高的人更多卷入了致命车祸，说明第二种方法是有效的

楚小澈

虽然检测酒精可以避免危险的事故但是不能避免微小的事故，因为 whereas in less-serious accidents the proportion of legally intoxicated drivers is lower.
但是他们不能走直线~~~~~