The book took ten years of thorough research.

The book took ten years of thorough research. A.basic B.careful C.social D.major

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The Ice Age twenty thousand years ago greatly benefits manki

The Ice Age twenty thousand years ago greatly benefits mankinds in the long term

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According to the passage, the glaciers moved from the north

According to the passage, the glaciers moved from the north directly the the sou

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He lacked the strength to deal with all these problems.

He lacked the strength to deal with all these problems. A.A think of B.B talk ab

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