题目内容：
Questionsare based on the following passage。A sunflower is a sunflower. A mobile phone is a mobile phone. But can you 47 the two to do something for your local 48 ? It may well be possible. When you have finished with your mobile phone you will be able to 49 it in the garden or a plant pot and wait for it to flower.
50 , a biodegradable(生物可降解的) mobile phone was introduced by scientists. It is hoped that the new type of phone will encourage 51 to recycle.
Scientists have come up with a new material over the last five years. It looks like any other 52 and can be hard or soft, and able to change shape. Overtime it can also break down into the soil without giving out any toxic 53 . British researchers
used the new material to develop a phone cover that contains a sunflower seed. When this new type of cover turns into waste, it 54 nitrates (硝酸盐). These feed the seed and help the flower grow.
Engineers have designed a small 55 window to hold the seed. They have made sure it only grows when the phone is thrown away.
"We've only put sunflower seeds into the covers so far. But we are working with plant 56 to find out which flowers would perform best. Maybe we could put roses in next time," said one scientist.
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作答（47）______
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