读图,“天体系统示意图”,回答下题.
占城稻属于早籼稻,具有耐旱、适应性强、生长期短等多种特点.这一优良品种引进于( )
_________to nuclear radiation, even for a short time, may produce variants of genes in human bodies.
fat(反义词)____
以下关于亚洲特征的描述中,正确的是( )