B. excitement

　　C. disappointment

　　D. enthusiasm

　　4. What can NOT be inferred from the text?

　　A. The writer made good preparation for the tour.

　　B. The Inca Trail took them four nights.

　　C. Machu Picchu is in the country of Peru.

　　D. They reached Intipunku ahead of time.

　　5. According to the writer, what attracted him most in the tour?

　　A. Mysterious ruins.

　　B. The famous post-card picture.

　　C. The hiking.

　　D. The Inca culture.

　　【参考答案】1—5、CDABC

　　阅读理解。

　　Electric ears are dirty.In fact, not only are they dirty, they might even be more dirty than their gasoline-powered cousins.

　　People in California love to talk about "zero-emissions vehicles", but people in California seem to be clueless about where electricity comes from. Power plants mostly use fire to make it. Aside from the new folks who have their roofs covered with solar cells, we get our electricity from generators. Generators are fueled by something---usually coal, oil,but also by heat generated in nuclear power plants. There are a few wind farms and geothermal plants as well, but by far we get electricity mainly by burning something.

　　In other words, those "zero-emissions" cars are likely coal-burning cars. It's just because the coal is burned somewhere else that it looks clean. It is not. It's as if the California Greens are. covering their eyes---"If I can't see it, it's not happening." Gasoline is an incredibly efficient way to power a vehicle; a gallon of gas has a lot of energy in it.But when you take that gas (or another fuel) and first use it to make electricity, you waste a nice part of that energy, mostly in the form of wasted heat---at the generator, through the transmission lines, etc.

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