[单项选择]Seldom（）mistakes during my past few years of working here.
A. would I make
B. did I make
C. I did make
D. shah I make

[单项选择]Seldom（）any mistakes during my past few years of working there.
A. would I make
B. have I made
C. I made
D. shall I make

[单项选择]Seldom __________ any mistakes during my past five years'service here.


A. would I make
B. did I make
C. I did make
D. I would make

[单项选择]Now scientists have found in the past few years _________.


A. the exposure of DNA to the public is unnecessary
B. the tiny cell in DNA is a neat little machine
C. man knows nothing about DNA
D. man has much to learn about DNA

[单项选择]

Over the past few years, first radio, and now television, have shown the （） public, who are after all the electorate, what in fact（）when government bills are discussed and questions are asked.

A. average; turns up
B. ordinary; comes up
C. general; goes on
D. normal; lets on

[单项选择]For the past few years Susan had been _______ her income by the creation of fiction under a pen name.


A. extending
B. magnifying
C. exceeding
D. supplementing

[单项选择]Seldom（）any mistake during his past ten years of service there.
A. did he make
B. he made
C. he makes
D. he did make

[单项选择]During the past years the ______of automobile accidents in New York City has decreased.
A. degree
B. quantity
C. number
D. amount

[单项选择]What happened during the past four months

[单项选择]Life was extremely hard in the past. My grandmother had no chance to go to school, even the ______ school.
A. elemental
B. elementary
C. basic
D. introductory

[单项选择]During the next few weeks the scientists will be discussing the problem of how to ______ and control earthquakes.


A. foretell
B. foresee
C. forecast
D. forenotice

[单项选择]

During recent years we have heard much about "race": how this race does certain things and that race believes certain things and so on. Yet, the (21) phenomenon of race consists of a few surface indications.
We judge race usually (22) the coloring of the skin: a white race, a brown race, a yellow race and a black race. But (23) you were to remove the skin you could not (24) anything about the race to which the individual belonged. There is (25) in physical structure, the brain or the internal organs to (26) a difference.
There are four types of blood. (27) types are found in every race, and no type is distinct to any race. Human brains are the (28) . No scientists could examine a brain and tell you the race to which the individual belonged. Brains will (29) in size, but this occurs within every race. (30) does size have anything to do with intelligence. The largest brain (31) ex
A. since
B. if
C. as
D. while

[单项选择]American Policy during the years 1935 - 1936 may be described as being ______.


A. watchful
B. isolationist
C. peaceful
D. indifferent

[单项选择]During the years from 1957 to 1976, the birth rate of the United States


A. increased
B. experienced both falls and rises
C. was reduced
D. remained stable