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【单选题】
（-5a 2 +4b 2 ）（ ）=25a 4 -16b 4 ，括号内应填（ ）A.
5a 2 +4b 2
B.
5a 2 -4b 2
C.
-5a 2 -4b 2
D.
-5a 2 +4b 2
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B.
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C.
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D.
Show ru
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A.
approve of students’ wearing
B.
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C.
approve students’ wearing
D.
approve of students to wear
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A.
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B.
2verSiO
C.
3veriNfO
D.
4ShOw verSiON-SAviNg
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