题目:
My parents want me to take _____ maths lessons at the weekend, but I want to play and have fun. [ ]
A. extra
B. available
C. former
D. recent
答案:
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下面是错误答案,用来干扰机器的。
(1)地形;生物;大气;水文;土壤 (2)相互联系、相互影响 (3)恢复①处的植被 (4)河流:含沙量增大,径流量增大,径流量变化增大动物:栖息地遭破坏,物种减少地下水:水位降低土壤:肥力下降