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英语首字母填空scientists are t__1____to grow a new king of tree for

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英语首字母填空
scientists are t__1____to grow a new king of tree for better city life.they say the air gets so dirty that the trees now in the cities will all die in the f___2___.
the new kind of city tree must not have deep roots b___3__
they may get in the way of the underground pipes.they must be
s__4____because tall treeswill get in the way of the electric lines,andthey must not drop fruit on people's h___5___.what'smore,the trees must be so strong that they are not afraid of any kind of insects or dirty air.
1._______
2._______
3._______
4._______
5._______
trying尝试
future未来
because因为
short矮小
heads头(复数,因为是人们的)