1.你越努力學習，你取得的進步越大。

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2.這次活動旨在喚起人們保護環(huán)境的意識。

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3.如果你能留下來幫我，我將十分感激。

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4.有時候我也不明白自己為什么要干這樣的工作。

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5.因為全神貫注于他所讀的小說，他沒有注意到老師就站在他身邊。

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6.她一到家，就發(fā)現(xiàn)家里被人破門而入。

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7.更加糟糕的是，下一個世紀沙漠的面積有可能增加17%。

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8.中國已經(jīng)采取了許多有效措施來阻止沙漠化的進程，包括鼓勵農(nóng)民建柵欄。

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Next autumn when you see wild geese heading south for the winter flying in a V formation, you might think about what scientists have discovered as to why they fly that way.

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People who share a common direction and sense of community can get where they are going more quickly and easily because they are traveling on the push of one another.

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Wild geese honk (發(fā)出雁叫聲) from behind to inspire those up front to keep up their speed. What can we learn from this?

When a wild goose gets sick or wounded by gunshots，and falls out of the formation，two other geese will fall out with that goose and follow it down to lend help and protection. They will stay with the fallen goose until it is able to fly or until it dies，and only then will they go on with their own or with another formation to catch up with their group.

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