三级基因库（gene pool 3）
参考答案：
亲缘关系更远，彼此间杂交不实，杂种不育现象明显，基因转移困难。（远缘）
Parents and teachers in Shaanxi are happy about the news_____ more students will be admitted to universities, ______ makes students happy as well.
A．that; which
B．what; which
C．that; that
D．which; which
肉的解冻
