4. Light is the fastest thing in the world,        (其速度是每秒三十萬千米) .

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  1.        (不久前的一天) I 2.      (收到…一的來信) my friend,Li Ping,working in Tibet as a volunteer teacher. Li Ping says she is nowliving in a 3.        (偏僻的) village. The condition is poor. Children with no 4.        (課本) study in a classroom whose 5.        (屋頂) has a big hole. At first,she couldn't stand it,but later she 6.        (適應(yīng)) it In spite of difficulties ? children 7.        (渴望) learn knowledge. Li Ping teaches them some 8.        (相關(guān)的) 9.        (經(jīng)濟(jì)的) knowledge besides basic knowledge. She feels tired but happy.

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