阅读理解。

     The Grade 3 students at the Clean City School collect empty bottles. In June, they are going to take

them to a recycling (回收) center. They are going to sell the bottles and buy some books for the school

library. Kate has started a graph (图表) to show the number of the bottles they have collected. This is

the graph. 

                                Students Bottle Collection 

                        The months of the School Year

1. In October the students collected _______ empty bottles.

A. 80

B. 60

C. 40

D. 20

2. The students collected _______ more bottles in December than in January.

A. 10

B. 20

C. 30

D. 40

3. From the graph above, we know that the students picked up the same

    number of bottles in _______ and _______.

A. October; February

B. September; April

C. January; May

D. November; March

4. Why do the students collect empty bottles? Because they _______.

A. want to do something for their school

B. like empty bottles very much

C. want to play with the bottles

D. want to sell them to buy balls