A、mislead us into doing worthless things；B、prevent us from making further efforts；C、weaken our sense of accomplishment；D、suppress our desire for succe……｜09-10

  A、demand new laws on the use of plastics；B、urge consumers to cut the use of plastics；C、invite public opinion on the plastics crisis；D、disclose the cau……｜09-10

  A、U.S. Agriculture in Decline?；B、Import Food or Labor?；C、America Saved by Mexico?；D、Manpower vs. Automation?…｜09-10

  A、slow granting procedures；B、limit on duration of stay；C、tightened requirements；D、control of annual admissions…｜09-10

  A、To attract younger laborers to farm work.；B、To get native U.S. workers back to farming.；C、To use more robots to grow high-value crops.；D、To strength……｜09-10

  A、the rising number of illegal immigrants；B、the high mobility of crop workers；C、the lack of experienced laborers；D、the aging of immigrant farm workers…｜09-10

  A、Discrimination against foreign workers in the U.S.；B、Biased laws in favor of some American businesses.；C、Flaws in U.S. immigration rules for farm wo……｜09-10

  A、ambiguous；B、tolerant；C、supportive；D、cautious…｜09-10

  A、To handle the areas in serious danger first.；B、To carry it out before the year of 2020.；C、To perfect the emissions-permit auctions.；D、To obtain enou……｜09-10

  A、cultivate more drought-resistant trees；B、reduce the density of some of its forests；C、find more effective ways to kill insects；D、restore its forests ……｜09-10

  A、preserve the diversity of species in them；B、accelerate the growth of young trees；C、strike a balance among different plants；D、lower their present car……｜09-10

  A、global climate change may get out of control；B、people may misunderstand global warming；C、extreme weather conditions may arise；D、forests may become a……｜09-10