e plans to use other still larger boats. (13)There is also a proposal（提议）for a high-speed boat that will make the trip in only 15 minutes, but not everyone is happy about that. A lot of people feel that half an hour is just enough time to relax.
11. According to the speaker, how do commuters feel about crossing the Golden Gate Bridge by car? C)
12. What does the speaker say about ferry commuters? D)
13. How do commuters respond to plans for the future of the ferry? B)
Passage Two
How many teeth have you had failed in the past two year? If you follow the advice of Doctor Forsdick , you may be able to reduce the number of your visits to a dentist. Doctor Forsdick conducted（开展，进行）a two-year survey to find out how to prevent or reduce dental decay（龋齿）. 946 students took part in the experiment. 523 students cleaned their teeth within 10 minutes of eating . When possible, they used a tooth-brush . When this was impossible, they washed their mouth thoroughly with water. The remaining 423 students merely cleaned their teeth when they went to bed and when they got up in the morning. All the students had their teeth X-rayed at the end of the first and second years. At the end of the first year, the night and morning group had three times as many decayed teeth as the clean-after-each-meal group. At the end of the second year, the latter group had 53% fewer decayed teeth than the former group. (15) Doctor Forsdick has cleaned his teeth after every meal for 13 years, and has not had a single decayed tooth. (14) He pointed out that sugar is a major agent（因素）in dental decay, particularly the sugar in sweets, cakes and soft drinks（软饮料，可乐等）. (16) Ideally, you should keep a tooth-brush in your pocket and use it immediately after you have finished eating. When this is impractical, you can at least make sure that you have a drink of water and let the water through your teeth to force out any particles（微粒）of food. Seven out of ten people lose at least half their teeth by the time they are fifty. Many have a complete set of false teeth（假牙）by that time. In any case, neither toothache nor a visit to a dentist is very pleasant, so it is worthwhile making an effort to keep your own teeth as long as possible. The main preventative（预防的）agent（物质，剂）is simply water.
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