[单项选择]The author explains the difference between popular and learned words ______.


A. by contrast
B. by giving details
C. by a lot of examples
D. by making deductions

[单项选择]The author explains the difference between popular and learned words ______.


A. by contrast
B. by giving details
C. by a lot of examples
D. by making deductions

[单项选择]The vocabulary and grammatical difference between British and American English are so trivial and few as hardly ________.
A. noticed
B. to be noticed
C. being noticed
D. to notice

[单项选择]Which of the following best explains the author's use of the phrase "doubly burdened" in Par


A. A．4 A person who is iii does not contribute to production; treatment consumes economic resources.B. The per capita cost of preventive measures is only one-half of the per capita cost of treatment.C. The division between preventive medicine and curative medicine requires duplication of administrative expenses.D. The individual who is ill must be rehabilitated after the cure has been successful.

[单项选择]One difference between a constitutional monarch and the president not mentioned by the author is that the______.
A. monarch is non-elective
B. monarch has unlimited tenure
C. president has a limited veto
D. president is limited by the constitution

[单项选择]The difference between mountain climbing and shipwreck diving lies in ______.


A. the amount of oxygen
B. the atmospheric pressure
C. the breathing rate
D. the damaging degree of the human nervous system

[单项选择]What is the fundamental difference between conflict and functional theorists


A. Conceptions of political institution.
B. Conceptions of political power.
C. Functions of the ruling class.
D. Functions of the concentration of power.

[单项选择]The main difference between the investigation and the previous ones is that ______.
A. the researchers started with only one month old infants
B. the observers could rate the quality of child care efforts and analyzed them soon
C. the researchers were able to give the questionnaires to mothers in their homes
D. video equipment enabled researchers to observe what was happening directly

[单项选择]The most striking phonetic difference between American and British English is the pronunciation of ______ in words.
A. r
B. a
C. wh
D. er

[单项选择]

Passage Two
The difference between biological and physical science is not that one is inexact, the other exact, but in degree of exactness, this being related to the number of variables which must be dealt with simultaneously and the extent to which they can be controlled. In general, the biological sciences must deal with larger errors than the physical sciences; but this is not uniformly true, as the student will realize when he considers the accuracy of meteorological prediction or if he comprehends the meaning of the fact that the structural engineer considers it necessary very often to use a safety factor of two or three hundred per cent. The statistical principles of dealing with error of measurement, or in prediction and generalization, are the same whether the errors are large or small. Statistics is not a means of confusing issues that would otherwise be clear, nor a substitute for obtaining clear answers, but a means of checking and controlling conclusion
A. the skill of the scientist
B. the extent to which variables can be controlled
C. the requirements of the observer
D. the development of more accurate instruments

[单项选择]The main difference between natural and artificial selection is that human beings______.


A. control the direction of artificial selection
B. control the direction of natural selection
C. make new genes in artificial selection
D. make new genes in natural selection