2015-2016学年译林版高中英语必修4Unit 3 Tomorrow’s World Reading（共20张PPT）-302edu教育资源网

C. You can practise skills in a secure environment that otherwise would be quite dangerous. (L. 36)

or else

D. This urban planning is in the long term cheaper and more practical. (L.44 )

for a long time from now on

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