We work together to achieve our common purpose： ________ world that is safer， cleaner and healthier than ________ one we are living in.

A. the ； / B. a ； /

C. the ； the D. a ； the

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North American black bears are shy animals. They are fearful by nature， and will usually run away if they see or hear people. Because of this， it can be difficult for scientists to learn about these animals.

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