【单选题】Mothers and matchmakers(媒人) have always known that not being married is a definite health hazard. But when a team of researchers from the University of California, San Francisco, reported a few weeks ...
【单选题】Why Should We Worry About What We Shouldn't? It would be a lot easier to enjoy your life if there weren't so many things trying to kill you every day. The problems start even before you're fully awake...
【简答题】The author considers it impossible to obtain no-risk food because ________. A) no food is free from pollution in the environment B) pesticides are widely used in agriculture C) many vegetables contain...
【简答题】It was a very foggy day in London. The fog was so thick that it was impossible to see more than a foot or so. Buses, cars and taxis were not able to run and were standing by the side of the road. Peop...