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Most nations regard their airspace as extending upward as high as an aircraft can fly; no specific altitude, however, has been officially recognized as a boundary.
(A) as extending
(B) as the extent
(C) to be an extent
(D) to be an extension（A）
(E) to extend
I am B ,why?
Last spring a Colorado health department survey of 72 playgrounds in private child-care centers found unsafe conditions in 95 percent of them and they ranged from splinters to equipment near collapse.
(A) unsafe conditions in 95 percent of them and they ranged
(B) conditions in 95 percent were unsafe and ranging
(C) the ranging of unsafe conditions in 95 percent of them to be
(D) that 95 percent had unsafe conditions ranging（D）
(E) that 95 percent of them had conditions that were unsafe; the range was
i am E ,why?
thanks | 
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发表于 2004-11-26 17:25:00
