A:挡风沙
B:美观
C:反射阳光
D:遵守伊斯兰教的规定
随着生活水平的提高,同学们的消费观念也发生了变化。以下有关消费的言行正确的是( )
—Are all the students from in your class?
—No, there are only three in our class. The others are from other countries.
我国科学家把鱼的抗冻蛋白基因导入西红柿,提高了西红柿的耐寒能力.这一生物技术属于( )