An eyewitness' testimony is sometimes inaccurate because______.
A. he is of the same race as the suspect
B. he is shown photos of many similar faces
C. he lacks the professional help from the police
D. he has a small number of suspects in the lineup
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An inaccurate eyewitness testimony may lead to______.
A. the dismissal of the case
B. the disbelief in the court
C. the disrespect for the eyewitness
D. the conviction of an innocent person
Which of the following is true？
A. Water evaporated to atmosphere is unavailable to man because it is from useless plants.
B. Man can interfere with water evaporation by growing some plants.
C. Man can recycle evaporated water to grow useful plants.
D. Useful plants can collect the evaporated water which will be used for other purpose.
Which of the following can be classified as a mechanical valve？
A. Tilting disc device.
B. Aortic valve.
Collagenous tissue.
D. Porcine valve.
According to the passage, with the increasing rate of Aids, ______.
A. people on the top of the social ladder can't escape the infection
B. people will continue to be complacent
C. people will realize the consequences brought to economy
D. whites will alienate the black more
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