标志性特征：划线部分。一般来说（1）空格前是since, because则是假设题；（2）空格前是therefore, hence, thus是MUST BE TRUE / Main Point题。
（1）A, therefore B 填写AB之间的Gap 架桥
（2）A, however B 填写A的直接原因 与解释题做法相同
Which of the following most logically completes the passage?
Most bicycle helmets provide good protection for the top and back of the head, but little or no protection for the temple regions on the sides of the head. A study of head injuries resulting from bicycle accidents showed that a large proportion were caused by blows to the temple area. Therefore, if bicycle helmets protected this area, the risk of serious head injury in bicycle accidents would be greatly reduced, especially since .
(A) among the bicyclists included in the study's sample of head injuries, only a very small proportion had been wearing a helmet at the time of their accident
(B) even those bicyclists who regularly wear helmets have a poor understanding of the degree and kind of protection that helmets afford
(C) a helmet that included protection for the temples would have to be somewhat larger and heavier than current helmets
(D) the bone in the temple area is relatively thin and impacts in that area are thus very likely to cause brain injury
(E) bicyclists generally land on their arm or shoulder when they fall to the side, which
reduces the likelihood of severe impacts on the side of the head
Which of the choices most logically completes the following argument?
NowNews, although still the most popular magazine covering cultural events in Kalopolis, has recently suffered a significant drop in advertising revenue because of falling circulation. Many readers have begun buying a competing magazine that, at 50 cents per copy, costs less than NowNews at $1.50 per copy. In order to boost circulation and thus increase advertising revenue, NowNews’s publisher has proposed making it available at no charge. However, this proposal has a serious drawback, since .
(A) Those Kalopolis residents with the greatest interest in cultural events are regular readers of both magazines.
(B) One reason NowNews’s circulation fell was that its competitor’s reporting on cultural events was superior.
(C) The newsstands and stores that currently sell NowNews will no longer carry it if it is being given away for free.
(D) At present, 10 percent of the total number of copies of each issue of NowNews are distributed free to students on college campuses in the Kalopolis area.
(E) NowNews’s competitor would begin to lose large amounts of money if it were forced to lower its cover price.