在实数范围内将(ax+by)2+(ay-bx)2+c2x2+c2y2分解因式，得()．
A. (a+b+c)(x2+y2)
B. (a2+b2+c2)(x2+y2)
C. (a2+b2-c2)(x2+y2)
D. (a2+b2+c2)(x2-y2)
E. 以上答案均不正确
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The last paragraph implies that RFID technology ______
A. will not be used for such matters as buying milk
B. will be widely used, including for buying milk
C. will be limited to communication uses
D. will probably be used for pop music
A．copyB．comerC．color
A. copy
B. comer
C. color
The surveillance of personal communication is only ______ when it assists in matters of national security.
A. permitting
B. permissive
C. permissible
D. permission
The combined value of the companies ______ on the New York Stock Exchange is in excess of
A. lists
B. listed
C. listing
D. to list
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