眶距过窄，常见于下列哪些疾病（）
A.额缝早闭
B.冠状缝早闭
C.矢状缝早闭
D.唐氏综合征
E.端脑发育异常
参考答案：A, C, D, E
— Look! The black clouds are gathering, which indicates that it __________ rain soon.
— Yes, black clouds are the _________ of the rain. [ ]
A. is going to; signal
B. will; mark
C. is gong to; sign
D. is to; sign
