题目

－It is useless trying to help Jack with his maths. He is so poor at it. －I know, but is he _____ better at it now? A．much                         B．little                    C．even                   D．any 答案：D据报道，我国的野生东北虎不足10只，白鳍豚仅存200只，亚洲象仅存50只，大熊猫也不过1000只，野骆驼只在罗布泊被重新发现，产生这些现象主要的原因是A.这些动物没有变异B.人类破坏了它们的生存自然环境C.它们对环境不能产生应激性D.这些动物没有适应性