题型：名词解释 The first edition ____ in 1955 and ____ a best seller ever since.A. was published; had been B. had been published; had been C. has been published; has been D. was published; has been 查看答案
题型：名词解释 我国矿产资源开发和利用的原则包括（）。A.坚持区域矿产资源勘察、开发与环境保护协调发展B.坚持进一步扩大对外开放与合作C.坚持市场经济体制改革方向D.坚持推进产业结构优化升级E.坚持实施可持续发展战略 查看答案