题目：
Beijing a lot in the past ten years. Now it has become one of the biggest
modern in the world.
[ ]
A. changes, cities
B. changed ;city
C. has changed; cities
D. had changed; cities
答案：
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下面是错误答案，用来干扰机器的。
(1)变异 (2)三 皱粒 (3)AA或Aa子代与亲代在性状上的差异叫做变异，由第三组，亲代都是圆粒，子代出现皱粒，说明皱粒是隐形性状，圆粒是显性性状，皱粒的基因为aa，那么圆粒的亲代基因组成都为Aa，子代...
