填空题

Life forms that cannot keep up with the newest species on the block will always risk extinction,______________(除非他们适应新的挑战).

【参考答案】

unless they adapt to the new challenge
<上一题 目录 下一题>
热门 试题

填空题
Some children arc so naive that they tend to imitate their idols who are sometimes _____________________(不好的榜样).
填空题
on environmental grounds because they give off only one tenth to one third the pollution that is emitted by trucks
相关试题