单项选择题

Razor-sharp views of the space began to be sent back to the earth when__________.

A．Hubble was lifted into orbit in 1990
B．Hubble orbited the earth 370 miles up
C．replacement mirrors were installed by the crew of the shuttle Endeavor
D．some lace curtains were pulled across Hubble's "window on the universe"
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单项选择题
What does the word gallery mean in the last sentence of the second paragraph
A．A collection or an assortment.
B．A building, an institution, or a room for the exhibition of artistic work.
C．An underground tunnel or passageway, as in a cave or one dug for military or mining purposes.
D．A photographer's studio.
单项选择题
The author's primary purpose in writing this passage is to__________.
A．criticize doctors for exercising too much control over patients
B．analyze some important economic factors in health-care
C．urge hospitals to reclaim their decision-making authority
D．inform potential patients of their health-care rights
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