单选题 Allelomimetic behavior may be defined as behavior in which two or more individual animals do the same thing, with some degree of mutual simulation and coordination. It can only involve in species with sense organs that are well enough developed so that continuous sensory contact can be maintained. It is found primarily in vertebrate, in those species that are diurnal, and usually in those that spend much of their lives in the air, in open water or on open plains.
In birds, allelomimetic behavior is the rule rather than the exception, though it may occasionally be limited to particular seasons of the year as it is in the redwing blackbird. Its principal function is that of providing safety from predators, partly because the flock can rely on many pairs of eyes to watch for enemies, and partly because if one bird reacts to danger, the whole flock is warned.
Among mammals, allelomimetic behavior is very rare in rodents, which almost never move in flocks or herds. Even when they are artificially crowded together, they do not conform in their movements. On the other hand, such behavior is a major system among large hoofed mammals such as sheep.
In the pack-hunting carnivores, allelomimetic behavior has another function that of cooperative hunting for large prey animals such as moose. Wolves also defend their dens as a group against larger predators, such as bears. Finally, allelomimetic behavior is highly developed among most primate groups, where it has the principal function of providing warning against predators, though combined defensive behavior is also seen in troops of baboons.

单选题 The author implies that alMomimetic behavior occurs most often among animals that ______.

【正确答案】 C

【答案解析】[解析] 在文章第三段最后—句话中可以找到答案：On the other hand, such behavior is a major system among large hoofed mammals such as sheep. (另一方面，这种行为在长蹄的大型哺乳动物如羊群等身上最为普遍。)羊群以群体活动为主，这种行为比其他哺乳动物更普遍，因此C为正确答案。A、B和D三项均不合题意。文中提到过猛禽在猎取prey animals(被掠食者)时也有这种allelomimetic behavior的功能，但发生在它们身上的可能性远没有发生在被掠食动物身上的可能陛大。

单选题 Which of the following is most clearly an example of allelomimetic?

【正确答案】 B

【答案解析】[解析] allelomimetic behavior意为“遗传模仿行为”，在所给四个选择中B能够说明问题，因为牲畜受到大火的威胁时，就产生一种自我保护本能，采取保护自己的行动，逃离火源，所以B为正确答案。A．掠食肉类动物的熊。不合题意，熊是不是掠食食肉动物的动物，我们暂且不管它，但有一点是肯定的，熊不是allelomimetic之类的动物。C．在跑道上赛跑的马。马是驯服的动物，也没有allelomimetic功能。D．和警察一起工作的狗。狗是人类的忠实朋友，和警察的合作非常密切，更不会有这种功能。

单选题 According to the passage the primary function of allelomimetic behavior in bird is to ______.

【正确答案】 D

【答案解析】[解析] 根据短文，鸟类遗传行为的主要功能是警惕掠食者。如果选A．保护鸟巢不受掠食者侵扰。主次颠倒，不合题意。主要功能是保护鸟类本身，而不是鸟巢。如果选B．相互对视，aUelommelic behavior更没有这种功能，离题太远。如果选C．放置被捕食的动物，文不对题，极不可取。

单选题 According to the passage, what happens to the behavior of rodents when they are artificially crowded together?

单选题 Which of the following groups of human beings would probably show the greatest amount of allelomimetic behavior?

【正确答案】 C

【答案解析】[解析] 有些动物包括人类在受到干扰或攻击时有一种自我保护意识和遗传模仿行为。根据文章内容，可以推断遗传模仿行为在动物中常用作自我保护。这样，我们就可进一步推测在人类中也类似。可看出，侦察兵在执行任务时，容易受到敌人的攻击，自我保护意识强，因而也最可能具有遗传模仿行为，所以C项最佳。