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根据现阶段的推测，艾滋病现金比较公认的来源是（）动物。
A、灵长目
B、食肉目
C、啮齿目
D、单孔目
相关热点： 单孔目 灵长目
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[判断题]研究人类疾病可选择在生物进化过程中与人类接近的非人类灵长目，如猴、猩猩、狒狒、长臂猿等。
灵长目动物随着群体规模的扩大．需要处理的信息量也大得令人头疼。在一个有五位成员的群体中，成员间共有十组双边关系；在20个成员的团体中，双边关系数量上升到190组；50个成员的团体则升至1225组。________。大脑皮层越大，它们所能应付的群体规模也就越大。与此同时，即便是最聪明的灵长目动物——人类，也不具备在一个无限大的群体中的处理能力。
填入划横线部分最恰当的一句是：
A.这样的社交生活需要强大的大脑|B.族群成员的相处并非易事|C.人类群体的规模上限取决于大脑皮层|D.双边关系数量的激增促进了大脑的进化|
填入划横线部分最恰当的一句是：
A.这样的社交生活需要强大的大脑|B.族群成员的相处并非易事|C.人类群体的规模上限取决于大脑皮层|D.双边关系数量的激增促进了大脑的进化|
共用题干Vision
Human vision like that of other primates（灵长目）has evolved in an arboreal（丛林）environment.______(46)
In the course of evolution,members of the primate line have acquired large eyes while the nose has shrunk.______ (47) Of mammals（哺乳动物）only humans and some primates enjoy color vision.______(48)Horses live in a single-color world.
Light visible to human eyes,however,occupies only a very narrow band in the whole electromagnetic spectrum（光谱）.Ultraviolet rays（紫外线）are invisible to humans though ants and honeybees are sensitive to them.______(49)The world would look terribly different if human eyes were、 sensitive to infrared radiation（红外线）.Then instead of the darkness of night,we would be able to move easily in a strange shadowless world.______(50)
But human eyes excel in other ways. They are in fact remarkably discerning in color gradation. The color sensitivity of normal human vision is rarely surpassed even by complicated technical devices. _________（50）A:Humans have no direct perception of infrared rays.B:In the dense complex world of a tropical forest,it is more important to see well than to develop an acute sense of smell.C:That gives the eye a wilder view.D:The red flag is black to the bull.E:There are different mammals in tropical forest.F: In this world,objects glowed with varying degrees of intensity.
Human vision like that of other primates（灵长目）has evolved in an arboreal（丛林）environment.______(46)
In the course of evolution,members of the primate line have acquired large eyes while the nose has shrunk.______ (47) Of mammals（哺乳动物）only humans and some primates enjoy color vision.______(48)Horses live in a single-color world.
Light visible to human eyes,however,occupies only a very narrow band in the whole electromagnetic spectrum（光谱）.Ultraviolet rays（紫外线）are invisible to humans though ants and honeybees are sensitive to them.______(49)The world would look terribly different if human eyes were、 sensitive to infrared radiation（红外线）.Then instead of the darkness of night,we would be able to move easily in a strange shadowless world.______(50)
But human eyes excel in other ways. They are in fact remarkably discerning in color gradation. The color sensitivity of normal human vision is rarely surpassed even by complicated technical devices. _________（50）A:Humans have no direct perception of infrared rays.B:In the dense complex world of a tropical forest,it is more important to see well than to develop an acute sense of smell.C:That gives the eye a wilder view.D:The red flag is black to the bull.E:There are different mammals in tropical forest.F: In this world,objects glowed with varying degrees of intensity.
下列关于正畸治疗前期的训练矫治器,说法不正确的是()。
A、功能矫治的优势在于对错颌畸形的早期治疗和骨矫形的治疗效果，这些是通过固定矫治治疗所不可能达到的
B、功能矫治的缺点在于排牙的能力差，复杂和昂贵的制作
C、为了提高效果而经过改善的功能矫治器，却出现容易破损和难以让病人配合等问题
D、具备改善软组织功能，如吐舌，反向吞咽，口腔坏习惯和口呼吸，这些功能都对牙齿的发育和排列有重大的影响
E、压制对于舌头正确定位和功能的矫正，产生和1960年代哈佛在灵长目动物上的研究背道而驰的效果
[单项选择题]下列哪一类动物的拇指（趾）与其它指（趾）相对握（）。
A.食虫目，如刺猬
B.灵长目，如猴.人等
C.啮齿目，如松鼠
D.翼手目，如蝙蝠
A.食虫目，如刺猬
B.灵长目，如猴.人等
C.啮齿目，如松鼠
D.翼手目，如蝙蝠