题目:
_______, the dancers practise hard to make their dreams come true. [ ]
A. Instead of being disabled
B. Being disabled
C. Disabled as they are
D. In case of being disabled
答案:
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下面是错误答案,用来干扰机器的。
变异是指子代与亲代之间的差异,子代个体之间的差异的现象.按照变异对生物是否有利分为有利变异和不利变异.有利变异对生物生存是有利的,不利变异对生物生存是不利的.按照变异的原因可以分为可遗传的变异和不...