world trade centre twin towers which________ destroyed in september 2001，________ 417 and 415 metres high.
a．were；were b．was；was
c．were；was d．was；were
2．research________ that eating habits are changing fast.
a．points b．says c．indicates d．means
3．we look forward to the day when the car will be replaced by some less dangerou资源难易程度:★★★★★★★★★★★★★★★
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