更多"Scientists say it may be five or si"的相关试题:
[单项选择]Scientists say it may be five or ten years ______ it is possible to test this medicine on human patients.
A. since
B. before
C. after
D. when
[单项选择]Scientists say it may be ten years ______ this medicine was put to use.
A. since
B. before
C. after
D. when
[单项选择]The Prime Minister was followed by five or six __________ when he got off the plane.
A. laymen
B. servants
C. directors
D. attendants
[单项选择]Scientists have spent years into the effects of certain chemicals on the human brain, but with no result.（）
A. studying
B. researching
C. investigating
D. inspecting
[单项选择]What will social scientists do in the years ahead
A. Warn people of the danger to live in space.
B. Offer opportunities for development to other scientists.
C. Discuss the relationship between space and man.
D. Study systematically the changes that space colonization may bring.
[单项选择]After years of strenuous work, the scientists are on the __________.of a great discovery of human gene.
A. domain
B. premise
C. threshold
D. pretext
[单项选择]Scientists have discovered in the past few years that ______.
A. the exposure of DNA to the public is unnecessary
B. the tiny cell in DNA is a neat little machine
C. man actually knows nothing about DNA
D. man has much to learn about DNA
[单项选择]In spite of______among a few scientists, and years of______discussion, the claim that earthquakes can be predicted with great precision prevails.
A. (A) antipathy … favorable
B. (B) skepticism … contentious
C. (C) mutualism … polite
D. (D) receptiveness … intelligent
E. (E) popularity … rancorous
[单项选择]Scientists have spent years_________ into the effects of certain chemicals on the human brain with no results.
A. studying
B. investigating
C. researching
D. inspecting
[单项选择]Only (within) the past 200 years (scientists have) found (out what) fire (is).
A. within
B. scientists have
C. out what
D. is
[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]Scientists have ------- for years that turbulence within the gaseous clouds found throughout the Milky Way stymies star formation, but some of the forces behind this disturbance remain -------.
A. (A) doubted... insufferable
B. (B) posited... unknown
C. (C) argued... relative
D. (D) assumed... exoteric
E. (E) conveyed ... insuperable
[单项选择]Scientists have______for years that turbulence within the gaseous clouds found throughout the Milky Way stymies star formation, but some of the forces behind this disturbance remain______.
A. (A) doubted … insufferable
B. (B) posited… unknown
C. (C) argued… relative
D. (D) assumed… exoteric
E. (E) conveyed … insuperable
[单项选择]After years of research, scientists have ______ the virus that is responsible for the disease.
A. recognized
B. identified
C. guaranteed
D. notified
[单项选择]After seven years' work, Chinese scientists ______ the task of launching their country's first spaceship in seven years.
A. achieve
B. accomplish
C. fulfill
D. complete
