B．In the science labs．

　　C．In the classrooms．

　　19．What can students do in the practical areas?

　　A．Take science courses．

　　B．Enjoy excellent meals．

　　C．Attend workshops．

　　20．When are the visitors expected to ask questions?

　　A．During the lunch hour．

　　B．After the welcome speech．

　　C．Before the tour of the labs．

　　第二部分 阅读理解(共两节，满分40分)

　　第一节(共15小题；每小题2分，满分30分)

　　阅读下列短文，从每题所给的四个选项(A、B、C和D)中，选出最佳选项。并在答题卡上将该选项涂黑．

　　A

　　Scientists have claimed a milestone in the drive for new energy—development of the

　　first practical artificial leaf, an advanced solar cell that imitates the process，called

　　photosynthesis(光合作用)，that green plants use to make sunlight and water into energy.

　　“A practical artificial leaf has been a dream of scientists for decades，”said Daniel Nocera，who led the research team．“We believe we have made it．The artificial leaf shows particular promise as an inexpensive source of electricity for homes of the poor in developing countries. One can imagine villages in India and Africa soon purchasing an affordable basic power system based on this technology．”

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