50、 请在第__(50)__处填上正确答案。
A.But this advantage also has a big drawback up to % of the biggest toads suffer from arthritis.
B.The task now facing the country is how to remove the toads.
C.But arthritis didnt slow down toads outside the laboratory.
D.Toads with longer legs move faster and travel longer distances while the others are being left behind.
E.Toads are not built to be road runners -- they are built to sit around ponds and wetareas.
F.Furthermore, they soon take over the natural habitats of Australias native species.
下面的短文有l5处空白,请根据短文内容为每处空白确定l个最佳选项。
51、根据材料,回答{TSE}问题。
Better Solar Energy Systems: More Heat, More Light Solar photovoltaic thermal energy systems, or PVTs, generate both heat and electricity, but(51) __________ now they havent been very good at the heat-generating part compared to a stand-alone solar thermal collector. Thats because they operate at low temperatures to cool crystallinesilicon solar cells,(52) __________ lets the silicon generate more electricity but isnt a very efficientway to gather heat.
Thats a problem of economics. Good solar hot-water systems can harvest much moreenergy than a solar-electric system at a substantially lower(53) __________. And its also a spaceproblem: photovoltaic cells can (54) __________ up all the space on the roof, leaving little room forthermal applications.
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