下列关于养蚕的方法的描述正确的是()。
A、蚕卵孵化不需要适宜的温度与湿度
B、蚁蚕吃的桑叶要切成碎片或条状
C、蚕宝宝要在封闭的盒子里饲养,防止被虫咬
参考答案:B
The schoolboys and schoolgirls are walking along the street, a small redcap .
A.each of them has
B.they each have
C.every wears
D.each wearing
碘缺乏病可表现为()。
A.智力低下
B.骨质硬化与骨质疏松
C.多发性病理骨折
D.视野缩小
E.皮肤色素沉着