[单项选择]Attempts to make artificial organs fail because______.


A. it is difficult to make artificial organs as natural as body organs
B. it is difficult to imitate the human world
C. the production process is complicated
D. the production is limited by nature

[单项选择]Attempts to make artificial organs fail because______.


A. it is difficult to make artificial organs as natural as body organs
B. it is difficult to imitate the human world
C. the production process is complicated
D. the production is limited by nature

[单项选择]The danger of transplanting animal organs into humans is that______.


A. it is considered ethically wrong
B. it may bring diseases into human bodies
C. it brings parasites into human bodies
D. it does more harm than good to humans

[单项选择]Attempts to introduce myxomatosis into New Zealand to control rabbit population have failed, mainly because ______.


A. increasing resistance to the disease is becoming apparent
B. there are no species of insects transmitting the disease in this country
C. flea and mosquito without the disease are absent in this country
D. the myxomatosis virus has been introduced into Australia

[单项选择]Modern linguistics attempts to describe and analyse the language people actually use, and not to lay down rules for "correct" linguistic behaviour, so it is supposed to be


A. descriptive.
B. prescriptive.
C. communicative.
D. predictive.

[单项选择]

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 of the 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
A. even
B. indeed
C. moreover