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          The adobe dwellings (土坯房)  {#blank#}1{#/blank#}  （build）by the Pueblo Indians of the AmericanSouthwest are admired by even  {#blank#}2{#/blank#} most modern of architects and engineers. In addition to their simple beauty, what makes the adobe dwellings admirable is their  {#blank#}3{#/blank#} (able) to “air condition” a house without  {#blank#}4{#/blank#}( use) electric equipment. Walls made of adobe take in the heat from the sun on hot days and give out that heat   {#blank#}5{#/blank#}( slow) during cool nights, thus warming the house. When a new day breaks, the walls have given up their heat and are now cold enough  {#blank#}6{#/blank#}(cool) the house during the hot day;{#blank#}7{#/blank#} the same time, they warm up again for the night. This cycle       (go) day after day: The walls warm up during the day and cool off during the night and are thus always a timely offset(抵消) for the outside temperatures. As {#blank#}9{#/blank#}  (nature) architects, the Pueblo Indians figured out exactly {#blank#}10{#/blank#}  thick the adobe walls needed to be to make the cycle work on most days.

    Ten Chinese engineers were driving down a road to a NationalForest Park.

    They were{#blank#}1{#/blank#}(sudden) amazed by what they saw. Three tall animals,{#blank#}2{#/blank#}(cover) with long black hair, werecrossing the road. On {#blank#}3{#/blank#}(see) the animals, the engineers immediately stopped and ran after them. However, when they saw {#blank#}4{#/blank#}move through the forest with great speed and strength, they did not dare to follow any {#blank#}5{#/blank#}(far).

    The men did not take any photographs but scientists were delighted by the {#blank#}6{#/blank#}(discover), because the engineers are all well educated people and scientists feel they canrely on what they {#blank#}7{#/blank#}(describe).

    Scientists returned to the forest, collected some hair and measured footprints, {#blank#}8{#/blank#}are about 20 inches. They appear to be the animals' feet! Chinese scientist have now set upa special group to exchange information and made a study of the forest. But inthe meantime, some people refuse to believe that this half-man, half-monkey {#blank#}9{#/blank#}(exist). They will not believe it {#blank#}10{#/blank#}oneof the animals have been caught.

    A sand storm often takes place in the northern China, {#blank#}1{#/blank#} is a kind of natural disasters. China usually experiences this kind of weather between February and May, while March and April see the most frequent and the {#blank#}2{#/blank#} (strong) sand storms. It becomes a very important environmental problem. It does damage {#blank#}3{#/blank#} the society as well as the environment. Firstly, the strong wind destroys soil and plant cover by {#blank#}4{#/blank#} (bury) fields with sand and dust. Secondly, by leaving too much dust in the air it will {#blank#}5{#/blank#}(serious) pollute the air. Thirdly, a sand storm will have {#blank#}6{#/blank#}bad effect on transportation. The dust in the air makes traffic and aircraft movements more difficult. And when the sand buries the roads, the traffic will{#blank#}7{#/blank#}(block). When plants in the farmland are buried, food supply will lose.

    Sand storms are another {#blank#}8{#/blank#}(punish) nature gives to mankind. We should not only take effective measures {#blank#}9{#/blank#}(stop) them, but also draw some {#blank#}10{#/blank#}(lesson) from them. We should not develop the economy (经济) at the cost of the natural environment.

    Are you sometimes a little tired {#blank#}1{#/blank#} sleepy in the early afternoon? Many people feel this way after lunch. They may think that eating lunch is the cause of the sleepiness. Or, in summer, they may think it is the heat. However, the real reason lies inside their bodies. At that time——about eight hours after {#blank#}2{#/blank#} (wake) up——your body temperature goes down. This is what makes you slow down and feel sleepy. Scientists have tested sleep habits in experiments in {#blank#}3{#/blank#} there was no night or day. The people in these experiments almost always {#blank#}4{#/blank#} (follow) a similar sleeping pattern. They slept for one long period and then for one short period about eight hours {#blank#}5{#/blank#}.

    In many parts of the world, people take naps {#blank#}6{#/blank#} the middle of the day. This is {#blank#}7{#/blank#} (especial) true in warmer climates, where the heat makes it difficult {#blank#}8{#/blank#} (work) in the early afternoon. Researchers are now saying that naps are good for everyone in any climate. A {#blank#}9{#/blank#} (day) nap gives one a more rested body and mind and therefore is good for health in general. In countries where naps are traditional, people often suffer less from {#blank#}10{#/blank#} (problem) such as heart disease.