【简答题】Replace the italicized parts in the following sentences with words or expressions from the following. underlying, a string of, energy conservation, renewable energy, thrive on, pose a threat to, hit a...
【简答题】has, he ,since, away, been , ago, years , China , from _______________________________________________________________. 小题1: should , to ,green, what, we, do, live, a ,life ___________________________...
【单选题】As American farmers approach the 21 st century, they still face someof the same problem they have been confronted with during the 20 th century. One of the most important is .