【题目】A number of students trees every year and the number of them increasing.
A．plant; is B．plants; is
C．planting; is D．planting; are
在线课程【答案】 A
【解析】
试题分析：考查a number of与the number of的区别及主谓一致用法。句意：每年有很多学生种树并且他们的人数在增加。a number of许多，谓语动词用复数；the number of……的数量，谓语动词用单数。故选A项。