Girls are afraid of math .They think they have some learning it .
A. questions
B. problems
C. problem
D. troubles
网友回答
A. questions
(答案→)B. problems
C. problem
D. troubles
解析：本题的含义是女孩害怕数学，她们认为她们在学习数学时会有许多困难，表示在某方面有困难可写成have some problems （in）doing sth，trouble为不可数名词，不可加s，question是问的问题，与本题的题意不符，故本题选B。