Here is the story of rubber. From the earliest time it was common knowledge to the Peruvians(秘鲁人)that when a cut was made in the outside skin of a rubber tree, a white liquid like milk came out, and that from (21) a sticky mass of rubber might be made. This rubber is (22) when warm, so that it is possible to give it any (23) . The Peruvians made the (24) that it was very good for keeping out the wet. Then in the early 1800’s, the Americans made use of it for the first time. First they made overshoes to (25) their feet dry. Then came a certain Mr. Mackintosh, who made coats of cloth covered with natural rubber. From that day to this we have been coating cloth with rubber as Mr. Mackintosh (26) , and our raincoats are still named after (27) .
These first rubber overshoes and raincoats were all soft and sticky (28) summer, and hard and inelastic (没有弹性的)in the winter (29) it was cold. (30) the rubber
A. discovery
B. invention
C. search
D. research
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案例二：张先生今年40岁，妻35岁，单薪家庭，有一小孩10岁，现在住的房子价值40万元，无贷款。张先生有10万元存款，计划换房总价100万元，但是换房将花光这笔存款，并且又背上50万元的负债，想要60岁退休的梦想可能不易实现。假设张先生家庭年收入10万，年支出6万元，退休后年支出4万元，房贷利率4%。目前的支出不包括小孩上大学时的额外开销。工作期的实质报酬率8%，退休后的实质报酬率5%计算，退休后生活20年。 根据案例二，回答11～20题： |
The cost is going (21) for just about everything, and college tuition is no exception. According to a nationwide survey (22) by the College Board’s Scholarship Service, (23) at most American universities will be (24) of 9 percent higher this year over last.
The biggest increase will occur at private colleges. Public colleges, heavily subsidized by tax funds, will also (25) their tuition, but the increase will be a few percentage points (26) than their privately sponsored neighbors.
(27) a follow-up, the United Press international did their own study (28) Massachussetts Institute of Technology. At M. I. T. advisors recommended (29) students have $ 8,900 (30) for one year’s expenses, including $ 5,300 (31) tuition, $ 2,685 for room and (32) , $ 630 for personal expenses, and $ 285 for books and supplies. Ten years ago the tuition (33) only
A. of
B. in
C. to
D. for
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