(D) Shortage of oxygen at extremely high altitude is likely to affect thinking processes and cause errors of judgment.

　　(E) Most people who suffer from ordinary mountain sickness recover without any special treatment.

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　　29. The price of a full-fare coach ticket from Toronto to Dallas on Breezeway Airlines is the same today as it was a year ago, if inflation is taken into account by calculating prices in constant dollars. However, today 90 percent of the Toronto-to-Dallas coach tickets that Breezeway sells are discount tickets and only 10 percent are full-fare tickets, whereas a year ago half were discount tickets and half were full-fare tickets. Therefore, on average, people pay less today in constant dollars for a Breezeway Toronto-to-Dallas coach ticket than they did a year ago.

　　Which one of the following, if assumed, would allow the conclusion above to be properly drawn?

　　(A) A Toronto-to-Dallas full-fare coach ticket on Breezeway Airlines provides ticket-holders with a lower level of service today than such a ticket provided a year ago.

　　(B) A Toronto-to-Dallas discount coach ticket on Breezeway Airlines costs about the same in constant dollars as they did a year ago.

　　(C) All full-fare coach tickets on Breezeway Airlines cost the same in constant dollars as they did a year ago.

　　(D) The average number of coach passengers per flight that Breezeway Airlines carries from Toronto to Dallas today is higher than the average number per flight a year ago.

　　(E) The criteria that Breezeway Airlines uses for permitting passengers to buy discount coach tickets on the Toronto-to-Dallas route are different today than they were a year ago.

　　30. Combustion of gasoline in automobile engines produces benzene, a known carcinogen. Environmentalists propose replacing gasoline with methanol, which does not produce significant quantities of benzene when burned. However, combustion of methanol produces FORMaldehyde, also a know carcinogen. Therefore the environmentalists' proposal has little merit.

　　Which one of the following, if true, most supports the environmentalist' proposal?

　　(A) The engines of some automobiles now on the road burn diesel fuel rather than gasoline.

　　(B) Several large research efforts are under way to FORMulate cleaner-burning types of gasoline.

　　(C) In some regions, the local economy is largely dependent on industries devoted to the production and distribution of automobile fuel.

　　(D) FORMaldehyde is a less potent carcinogen t

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