施工动火（）米范围内，现场严禁有易燃物。
A.15
B.20
C.30
D.40
参考答案：A
In spring, a lot of young trees _______ in our city.
A. are planted
B. plant
C. has been planted
敬老院主要由乡政府建立，收纳的是孤寡老人。（）
