可持续发展指"在满足当代人需要的同时不影响后代人满足他们需要机会的一种生态意义的发展"。
参考答案：对
You have already tried your best, so you _____ worry about the matter. [ ]
A. can't
B. needn't
C. mustn't
D. couldn't
手阳明大肠经的起止穴是（）。
A.少商；中府
B.商阳；口禾髎
C.商阳；迎香
D.迎香；商阳
E.二间；迎香
