【简答题】A plane disaster Sunday has increased fears among already worried travelers, especially those in Southeast Asia. AirAsia flight QZ8501 _____1______ from radar Sunday while flying from Surabaya, Indone...
【单选题】It can not be denied that the existing resources on earth will be depleted, but scientists are______to concede the inevitability of that day,______that new energies can be found in the near future.