下图是鸡卵的结构图,请据图回答下列问题: (1)、取一枚鸡卵,将鸡卵的钝端轻轻敲出裂纹,用镊子将破裂的卵壳连同外壳膜除去,可观察到 ,其内储存供胚胎发育所需的氧气。 (2)为胚胎发育提供营养物质的结构是 和 (3)将来发育成雏鸡的结构是 (4)具有保护功能的结构是 和 Lots of people in our city the old and the disabled . They usually offer their seats to them on buses or help them cross the road. A.care for B.take care C.agree with D.take pride in