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发布时间：2006-06-21 20:58     点击：

(B) Prefabricated housing

(C) Triplexes and fourplexes

(D) Condominiums

20. What does the author imply about future housing development?

(A) It will continue to move away from the city centers.

(B) It will slow donw as the economy falters.

(C) All housing will be mobilized.

(D)The move towards suburbs has cut to the end.

Questions 21-30

When European explorers came across the densely clustered earthen homes of the southwestern American Indians, they described them as pueblos-the Spanish word for town or village. The name ocnveys the complexity of these ancient muti-storied buildings which marked a high point in teh enginnrng feats of the region's native people.

The earthen homes were typically built beneath a large rock overhang to take advantage of the shelter from winter rains and the hot desert sun. An additional advantage of this carefully chosen location was the ability to maintain steady internal temperatures through contact with the thermal mass of solid rock along the rear walls.

In the earliest times, the exteriors were made of sandstone blocks. Since this material was relatively soft, it was easy to cut slabs from the mountains and build thick walls mortared with mud from a nearby stream. In areas where the stone was either too difficult to cut, or where there was a short supply of suitable material, the blocks could be built from mud mixed with dried grass and small sticks, this product was known as "adobe."

Ingenious techniques were involved in the construction of the roofs. Although there were few trees available int eh desert regions, the men of the ribe would collect any lumber long enough to cover the span between the walls. These flexible poles were then interlaced with smaller sticks, and finally with small wigs and leaves. Once the covering was strong enough to walk on, river mud and dried grasses wer eapplied in several layers until a sufficient thickness had been accumulated to give the final rigid form.

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