单项选择题

The author says it is unfair to put the blame on all zoos because______.

A．zoos are different in many respects
B．many zoos serve to educate the visitors
C．some zoos act as a safety device for rare animals
D．zoos are being improved all the time
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单项选择题
The word inhabitants (in the fifth paragraph) refers to ______.A) animal welfare grounds C) collectionsB) prisons D) areas where zoos are built
A．The word "inhabitants" (in the fifth paragraph) refers to ______.
B．animal welfare grounds
C．prisons
D．collections
E．areas where zoos are built
单项选择题
What important respect was ignored in collecting animals in the past
A．Zoos provided inadequate entertainment for people.
B．Zoos were not aware of a responsibility to prove their collections right in regard to its importance for science, conservation and popular education.
C．Zoos paid so much attention to the benefit their collections brought that they ignored the needs of animals.
D．Zoos didn't bring their commercial potentialities into full play.
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