更多"Before the drug is used on human be"的相关试题:
[单项选择]Before the drug is used on human beings, experts have to ______ dogs.
A. be experimented
B. experiment
C. experiment with
D. experiment on
[单项选择]Human beings have used tools for a long time, ______ they would not have been able to develop their intelligent so fast.
A. doubtlessly
B. therefore
C. otherwise
D. consequently
[单项选择]Human beings cannot exist without air.
A. live
B. breathe
C. exercise
D. grow
[单项选择]Human beings make themselves different from other animals by ________.
A. having the ability to perceive danger
B. having a far greater memory capacity
C. having the ability to recognize faces and places on sight
D. having the ability to draw on past experiences
[单项选择]Since the ______ of human history, human beings have been asking questions like "What is the essence of life"
A. dusk
B. dust
C. twinkle
D. dawn
[单项选择]The three faculties in human beings mentioned are _______.
A. intellect, emotions, imagination
B. intellect, ideas, facts
C. thinking, abilities, emotions
D. thinking, distorting, departing
[单项选择]The human beings have polluted the environment seriously. It is time the United Nations must take some measures.
A. take
B. taking
C. to take
D. took
[单项选择]Human beings differ from animals because they can ______.
A. adapt to their environment
B. control their environment
C. adapt the environment to their need
D. observe and understand their environment
[单项选择]Psychologists agree that human beings have a strong need to ______ their time; having too much idle time can be as stressful as having none at all.
A. threaten
B. annihilate
C. structure
D. punctuate
[单项选择]Human beings differ mostly from all other animals in that they have the ability to ______ tools.
A. employ
B. tackle
C. deal
D. utilize
