题干
The maths problem is very easy, so I can work it out ________.
A：in trouble
B：without difficulty
C：by heart
D：with your help
答案(点此获取答案解析）
B
The maths problem is very easy, so I can work it out ________.
A：in trouble
B：without difficulty
C：by heart
D：with your help
，从上面看到的形状是 
，下面（ ）符合条件．
