45。典型的鹌鹑都长有短而圆的翅膀，凭此他们可以在受惊时一跃而起，飞离它们的躲藏地。

　　46. According to anthropologists, the earliest ancestors of humans that stood upright resembled chimpanzees facially, with sloping foreheads and protruding brows。

　　46。根据人类学家的说法，直立行走的人的鼻祖面部轮廓与黑猩猩相似，额头后倾，眉毛突出。 47. Not until 1866 was the fully successful transatlantic cable finally laid。

　　47。直到1866年第一条横跨大西洋的电缆才完全成功的架通。

　　48. In his writing, John Crowe Ransom describes what he considers the spiritual barrenness of society brought about by science and technology。

　　48. John Crowe Ransom在他的著作中描述了他认为是由科学技术给社会带来的精神贫困。

　　49. Children with parents whose guidance is firm, consistent, and rational are inclined to possess high levels of self-confidence。

　　49。父母的教导如果坚定，始终如一和理性，孩子就有可能充满自信。

　　50. The ancient Hopewell people of North America probably cultivated corn and other crops, but hunting and gathering were still of critical importance in their economy。

　　50。北美远古的Hopewell人很可能种植了玉米和其他农作物，但打猎和采集对他们的经济贸易仍是至关重要的。