前提事件：There are several winemakers producing wine to which no sulfites are added
结论事件：Those who would like to drink wine but are allergic to sulfites can drink these wines
without risking an allergic reaction to sulfites
提问Which of the following, if true, most seriously weakens the conclusion above?
(A) Sulfites occur naturally in most wine.
(B) The sulfites that can produce an allergic reaction are also commonly found in beverages other
(C) Wines without added sulfites tend to be at least moderately expensive.
(D) Apart from sulfites, there are other substances commonly present in wine that can trigger
(E) Wine without added sulfites sometimes becomes undrinkable even before the wine is sold to
前提事件：Last year, one candidate produced a half-hour-long advertisement. At the beginning of
the half-hour slot a substantial portion of the viewing public had tuned in to that station.
结论事件Clearly, then, many more people are interested in lengthy televised political messages
than was previously thought.
提问：Which of the following, if true, most seriously weakens the argument?
(A) The candidate who produced the half-hour-long advertisement did not win elec-tion at the polls.
(B) The half-hour-long advertisement was watched by other candidates before it was broadcast.
(C) The half-hour-long advertisement was aired during a time slot normally taken by one of the
most popular prime-time shows.
(D) Most short political advertisements are aired during a wide range of programs in order to reach
a broad spectrum of viewers.
(E) In general a regular-length television program that features debate about cur-rent political
issues depends for its appeal on the personal qualities of the pro-gram’s moderator.