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【单选题】
已知xy＜0，则 x 2 y 化简后为（ ）A.
x y
B.
-x y
C.
x -y
D.
-x -y
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【简答题】The author mentions the ports of Los Angeles and Long Beach to ______. ［A］prove they are the largest ports in the United States ［B］demonstrate they create many new job opportunities ［C］highlight that ...
【单选题】One reason why the loss of lives in the Los Angeles earthquake was comparatively low is that____.
A.
new computers had been installed in the buildings
B.
it occurred in the residential areas rather than on the highways
C.
large numbers of Los Angeles residents had gone for a holiday
D.
improvements had been made in the construction of buildings and highways
【单选题】One reason why the loss of lives in the Los Angeles earthquake was comparatively low is that
A.
new computers had been installed in the buildings
B.
it occurred in the residential areas rather than on the highways
C.
large numbers of Los Angeles residents had gone for a holiday
D.
improvements has been made in the construction of buildings and highways
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