[题目]Scientists have made a in their treatment of that disease. 题目和参考答案——青夏教育精英家教网—

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【题目】Scientists have made a （突破）in their treatment of that disease.

【答案】见解析

【解析】breakthrough

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It’s been a long time since I do something good for the environment. Feel responsible to protect the environment, I decided to take action again. I told my idea with my friends and we planned to plant the trees on the hill in the rural area of the city.

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