可持续发展可实现经济效益、社会效益和生态环境效益三个效益的统一。()
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The box is full and heavy.
A. True.
B. False.
The man can carry the box.
A. True.
B. False.
Sandwich was ______.
A. an Englishman
B. an American
C. a Frenchman
--Are they good friends?--______.
A. They are
B. Yes, they are
C. They're