to strengthen is collections.

　　90. The United States Constitution requires that President be a natural-born
citizen, thirty-five years of age or older, who has lived in the United States for
a minimum of fourteen years.

　　91. Arid regions in the southwestern United States have become increasingly
inviting playgrounds for the growing number of recreation seekers who own vehicles
such as motorcycles or powered trail bikes and indulge in hill-climbing contests
or in caving new trails in the desert.

　　92. Stone does decay, and so tools of long ago have remained when even the
bones of the man who made them have disappeared without trace.

　　93. Insects would make it impossible for us to live in the world; they would
devour all our crops and kill our flocks and herds, if it were not for the protection
we get from insect-eating animals.

　　94. It is true that during their explorations they often faced difficulties
and dangers of the most perilous nature, equipped in a manner which would make a
modern climber shudder at the thought, but they did not go out of their way to court
such excitement.

　　95. There is only one difference between an old man and a young one: the
young man has a glorious future before him and old one has a splendid future behind
him: and maybe that is where the rub is.

　　96. I find young people exciting. They have an air of freedom, and they have
not a dreary commitment to mean ambitions or love comfort. They are not anxious
social climbers, and they have no devotion to material things.

　　97. I am always amazed when I hear people saying that sport creates goodwill
between the nations, and that if only the common peoples of the world could meet
one another at football or cricket, they would have no inclination to meet on the
battlefield.

　　98. It is impossible to say simply for the fun and exercise: as soon as the
question of prestige arises, as soon as you feel that you and some larger unit will
be disgraced if you lose, the most savage combative instincts are around.

　　99. It has been found that certain bats emit squeaks and by receiving the
echoes, they can locate and steer clear of obstacles------or locate flying insects
on which they feed. This echo-location in bats is often compared with radar, the
principle of which is similar.

　　100. As the time and cost of making a clip drop to a few days and a few hundred
dollars, engineers may soon be free to let their imaginations soar without being
penalized by expensive failure.


　　13.理论在本质上是对认识了的现实的一种抽象和符号化的表达。

　　14.儿童在能说或能听懂语言之前，很久就会通过面部表情和靠发出噪声来与人交流了。

　　15.受当代灌溉(技术设施)之赐，农作物在原来只有仙人掌和荞属科植物才能生存的地方旺盛的生长。

　　16.机械计时器的发展促使人们寻求更精确的日晷，以便校准机械计时器。

　　17.人类学是一门科学，因为人类学家采用一整套强有力的方法和技术来记录观测结果，而这样记录下来的观测结果是供他人核查的。

　　18.真菌在腐化过程中十分重要，而腐化过程将化学物质回馈于土壤，提高其肥力，并分解 动物 粪便。

　　19.音叉被敲击时，产生几乎纯质的音调，其音量经久不衰。

　　20.虽然美洲山河桃树最集中于美国的东南部但是在北至俄亥俄州及伊利诺州也能看见它们。

　　21.用怪罪别人的办法来解决问题通常被称为寻找替罪羊。

　　22.一个国家的主要食物是什么，大体取决于什么作物在其天气和土壤条件下生长得最好。

　　23.在大量的实验中，某一事件发生的几率等于它不发生的几率。

　　24.大多数物质遇冷收缩，所以他们的密度在固态时高于液态。

　　25.大脑细胞储存记忆的机理并不为人明白。

　　26.到了二十一世纪中叶，美国画家和雕塑家开始在世界范围内对艺术产生重大影响。

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