碘缺乏病可出现
A.甲状腺肿大B.牙齿釉面着色和缺损C.皮肤色素沉着和过度角化D.心肌损害E.多发性病理骨折
参考答案:A
-It has been raining for nearly a week. Will it _________ long?
-No. It's _____ that we'll have a fine weekend. The sun will be shining again. [ ]
A. rain; report
B. last; reported
C. stop; reported
D. keep; report
高等动物的个体发育是一个受精卵开始的,这一点能说明高等动物( )
A.起源于水生的脊椎动物
B.起源于原始的单细胞生物
C.起源于原始的无脊椎动物
D.起源于陆地的无脊椎动物