【备考必备】托福官方真题Official3阅读长难句资料汇总

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托福官方真题Official3阅读长难句官方真题Official3：Architecture

1. In order for the structure to achieve the size and strength necessary to meet its purpose,　architecture employs methods of support that, because they are based on physical laws,have changed little since people first discovered them—even while building materials　have changed dramatically.

2. The arch was used by the early cultures of the Mediterranean area chiefly for　underground drains, but it was the Romans who first developed and used the arch　extensively in aboveground structures.

官方真题Official3：Depletion of the Ogallala Aquifer

1. Estimates indicate that the aquifer contains enough water to fill Lake Huron, but　unfortunately, under the semiarid climatic conditions that presently exist in the region,　rates of addition to the aquifer are minimal, amounting to about half a centimeter a year.

2. This unprecedented development of a finite groundwater resource with an almost　negligible natural recharge rate—that is, virtually no natural water source to replenish the　water supply—has caused water tables in the region to fall drastically.

3. The incentive of the farmers who wish to conserve water is reduced by their knowledge　that many of their neighbors are profiting by using great amounts of water, and in the　process are drawing down the entire region’s water supplies.

托福官方真题Official3阅读长难句

4. Unfortunately, the cost of water obtained through any of these schemes would increase　pumping costs at least tenfold, making the cost of irrigated agricultural products from the　region uncompetitive on the national and international markets.

5. Whatever the final answer to the water crisis may be, it is evident that within the High　Plains, irrigation water will never again be the abundant, inexpensive resource it was　during the agricultural boom years of the mid-twentieth century.

官方真题Official3: The Long-Term Stability of Ecosystems

1. Many ecologists now think that the relative long-term stability of climax communities　comes not from diversity but from the “patchiness” of the environment, an environment　that varies from place to place supports more kinds of organisms than an environment　that is uniform.