(   ) 1.——How long have you been away from your hometown?

      ―It has been 2 years       I left there.

A. since    B. when

C. after    D. while

1. A It is/has been +時間段+ since弓|導的一般過去時的從句,意為"自…… 以來已過去了多久"。

題目來源：仁愛英語同步練習冊九年級上冊下冊合訂本 > 單元闖關

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Recycling is a way to change waste materials into new products, so that they can be used more than once.

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Recycling, in fact,is not a simple process and it is different for each type of material. For example, to start recycling paper, people will mix it with water and some chemicals to break it down. In this way, the paper will be turned into pulp(紙紫).Then the glues or plastics will be removed from the pulp. After that,it gets cleaned to remove any' inks or dyes(染料). Now the pulp is ready to be made into new paper.

However, computers and batteries are usually recycled in order to remove harmful chemicals as well as to find again some useful materials such as gold.

Do you know the recycling symbol? It has three arrows(箭頭)，which stand for three different steps in the recycling process. First, collect recyclable materials. Second, process the old materials and make new items. Third, buy items made from recycled materials.

閱讀短文,選擇最佳選項。

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根據(jù)短文內容，選擇最佳答案。

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