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1£®She explained the ________(Ïë·¨) behind the campaign.

2£®Too much ________(µ°°×ÖÊ) in the diet may advance the ageing process.

3£®He escaped by sawing through the bars of his ________(µ¥¼äÀη¿).

4£®So far they have not found a way to fight the ________(²¡¶¾).

5£®One of the main ________(·¢ÏÖ) of the survey is that this chemical does harm to people’s health.

6£®My ________(×î³õµÄ)reaction was to decline the offer.

7£®Researchers around the world are working together to develop a new ________(ÒßÃç).

8£®The construction of this ________(¿ò¼Ü) took only a few minutes.

9£®He believes only ________(ÀíÂÛµÄ) science can create miracles.

10£®The snow had melted£¬but the lake was still frozen ________(¼áʵµÄ).

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