简述发行公司债券的程序

下列不是生物的特征的是

A．能进行呼吸    B．会移动  C能生长繁殖    D．能对刺激作出反应

美国著名的心理学家马斯洛提出的（）对社会工作的影响很大。

A.社会诊断论

B.社会学习论

C.需要层次论

D.认知发展理论

环氧乙烷()、丙酮、丁醛、葡萄糖的混合物，碳元素的质量分数为66%，则氧元素的质量分数为(    )

A．33%

B．27%

C．30%

D．23%

Now let’s look ourselves as a species in relation to ecosystem balance.Modern scientists believe that humankind, like other animals, evolved(进化) through millions of years of changes and adaptations to the environment and that our most direct evolutionary ancestor was probably an earlier species of the primate(monkey, ape) group. Despite this similarity with other creatures, however, the evolution of humankind differs from that of other species in one important and unique way.

In other species, evolution has led to specialization, both in the species abilities and in its place within the environmental structure. For example, the giraffe is much adapted to feeding on treetops, but it is also specialized and thus limited to feeding on trees and shrubs. Only with great difficulty can it bend down to graze on the ground. Similarly, the anteater is extremely well adapted to eating ants but is unable to catch or eat other animals. The same is true for countless other species.

For humankind it is opposite. Our evolution had led to a very generalized ability. Our highly developed intelligence and ability to make and handle tools mean that we can do almost anything. Humans evolved in such a way that we are able to move into every environment on Earth and even into space. No natural competitor offers great resistance, and other natural enemies such as disease have been controlled.

Said another way, we see in humankind a great imbalance between biological potential and environmental resistance. The result is the rapidly increasing world population, frequently referred to as the population explosion. Further, to support our growing population, natural ecosystems are being increasingly displaced by human habitations, agriculture, and other human supporting activities.

小题1:From the passage we can infer that in the course of evolution _______.

A．humankind is very important to earlier species, such as the primate group

B．human beings are limited by the environment while animals are not

C．human beings become more and more different from each other

D．humankind has experienced a generalization rather than specialization in ability小题2:According to the passage, primate includes such animals as _______.

A．monkeys and anteaters

B．tigers and apes

C．apes and monkeys

D．monkeys and giraffes小题3:According to the passage, evolution has made it possible for humans to _______.

A．increase the population

B．resist natural offers

C．go to the moon

D．cure all diseases小题4:According to the author, imbalance between biological potential and environ mental resistance has resulted in _______.

A．the population explosion

B．the destruction of human habitations

C．the growth of natural ecosystem

D．the specialization of humans

甲科研所与乙企业于2009年3月签订一份设备改造的技术服务合同，约定自2009年7月1日至12月1日，甲科研所负责对乙企业的自动生产线进行技术改造的指导工作。合同签订后，乙企业为履行合同做了一些准备工作。5月，甲科研所通知乙企业，因甲科研所某技术人员已经辞职，不能履行该合同。乙企业遂于6月1日诉于法院。下列表述正确的是( )。

A．乙企业有权解除合同，并追究甲科研所违约责任

B．乙企业有权主张合同无效，并追究甲科研所缔约过失责任

C．乙企业有权撤销合同，并追究甲科研所缔约过失责任

D．合同有效，乙企业应至7月1日才有权主张违约责任