实现海洋生物资源可持续发展的有效途径是[ ]
A、严禁近海捕捞
B、进行人工养殖和繁殖
C、进一步提高捕捞技术
D、加强远洋捕捞
答案：B
Our school doesn't _____ students' staying in the classroom too long. We think they should have
time for sports. [ ]
A. advocate
B. admit
C. assess
D. approach
自然界的煤可分为三大类，即（）、残植煤和腐泥煤。
