骑自行车时要注意,在任何情况下,行人和机动车都有优先的通过权。
参考答案:对
His father________his hometown for twenty years.He really misses it.
A.has been away from B.left C.has left
体内缺铁处于红细胞生成缺铁期时表现为______。
A.游离原卟啉浓度升高 B.血红蛋白浓度下降C.运铁蛋白浓度升高 D.出现临床症状