客户的网络连接形如：HostA----GE0/0--MSR-1--S1/0---------S1/0--MSR-2--GE0/0----HostB其中路由器MSR-1与路由器MSR-2通过专线实现互连，在MSR-1上配置了如下三条静态路由：iproute-static10.1.1.0255.255.255.03.3.3.1iproute-static10.1.1.0255.255.255.03.3.3.2iproute-static10.1.1.0255.255.255.03.3.3.3其中10.1.1.0/24是主机HostB所在的局域网段，那么如下描述哪些是正确的？（）。

A.只有第三条路由会被写入MSR-1的路由表

B.这三条路由都会被写入MSR-1的路由表，形成等值路由

C.只有第一条路由会被写入MSR-1的路由表

D.以上都不对

Attempts to understand the relationship between social behavior and health have their origin in history. Dubos (1969) suggested that primitive humans were closer to the animals (1) they, too, relied’upon their instincts to stay healthy. Yet some primitive humans (2) a cause and effect relationship between doing certain things and alleviating (3) of a disease or (4) the condition of a wound. (5) there was so much that primitive humans did not (6) the functioning of the body, magic became an integral component ofthe beliefs about the causes and cures of heath (7) Therefore it is not (8) that early humans thought that illness was caused (9) evil spirit. Primitive medicines made from vegetables or animals were invariably used in combination with some form of ritual to (10) harmful spirit from a diseased body.

One of the. earliest (11) in the Western world to formulate principles of health care based upon rational thought and (12) of supernatural phenomena is found in the work of the Greek physician Hippocrates. The writing (13) to him has provided a number of principles underiying modern medical practice. One of his most famous (14) , the Hippocratic Oath, is the foundation of contemporary medical ethics.

Hippocrates also argued that medical knowledge should be derived from a (15) of the natural science and the logic of cause and effect relationships. In this (16) thesis, On Air, Water, and Places, Hippocrates pointed out that human well-being is (17) by the totality of environmental (18) : living habits or lifestyle, climate, geography of the land, and the quality of air, and food. (19) enough, concerns about our health and the quality of air, water, and places are (20) very much written in twentieth century.

18（）

A.elements

B.factors

C.components

D.deposits