【简答题】阅读理解。 In 1620, about half the U. S. A. was covered by forests. Today the forests have almost gone. A lot of good land has gone with them, leaving only sand. China doesn't want to copy the U. S. A....
【简答题】American farmers have been complaining of labor shortages for several years. The complaints are unlikely to stop without an overhaul of immigration rules for farm workers. 2.Congress has obstructed ef...