15. In the United States, vacationers account for more than half of all visitors to what are technically called “pure aquariums” but for fewer than one quarter of all visitors to zoos, which usually include a “zoo aquarium” of relatively modest scope. Which of the following, if true, most helps to account for the difference described above between visitors to zoos and visitors to pure aquariums? (A) In cities that have both a zoo and a pure aquarium, local residents are twice as likely to visit the aquarium as they are to visit the zoo. (B) Virtually all large metropolitan areas have zoos, whereas only a few large metropolitan areas have pure aquariums. (C) Over the last ten years, newly constructed pure aquariums have outnumbered newly established zoos by a factor of two to one. (D) People who visit a zoo in a given year are two times more likely to visit a pure aquarium that year than are people who do not visit a zoo.（B） (E) The zoo aquariums of zoos that are in the same city as a pure aquarium tend to be smaller than the aquariums of zoos that have no pure aquarium nearby.
16. Which of the following, if true, is the most logical completion of the argument below? The tax system of the Republic of Grootland encourages borrowing by granting its taxpayers tax relief for interest paid on loans. The system also discourages saving by taxing any interest earned on savings. Nevertheless, it is clear that Grootland’s tax system does not consistently favor borrowing over saving, for if it did, there would be no______ (A) tax relief in Grootland for those portions of a taxpayer’s income, if any, that are set aside to increase that taxpayer’s total savings (B) tax relief in Grootland for the processing fees that taxpayers pay to lending institutions when obtaining certain kinds of loans (C) tax relief in Grootland for interest that taxpayers are charged on the unpaid balance in credit card accounts (D) taxes due in Grootland on the cash value of gifts received by taxpayers from banks trying to encourage people to open savings accounts（A） (E) taxes due in Grootland on the amount that a taxpayer has invested in interest-bearing savings accounts 这两题不会,请高人指教!!! | 
