10．請根據(jù)所聽內(nèi)容，在每小題給出的三個選項中，選出一個能完成句子的最佳答案，并將答題卡上對應題目所選的選項涂黑．錄音聽兩遍．
16．Ais the hardest part in the recycling program．
A．Searching B．Collecting C．Carrying
17．There will beBkinds of dustbins in the school next week．
A．one B．three C．four
18．Each volunteer will work forBa week．
A．only two hours B．less than five hours C．more than five hours
19．The waste clothes should be put in theBdustbin．
A．black B．red C．blue
20．The speaker is speaking toC．
A．some teachers B．some cleaners C．some greener volunteers．
