B. the internet

　　C. brain cells

　　D. human organs

　　33. Humans may live longer in the future because______________

　　A. heart disease will be far away from us

　　B. human brain can decide the final death

　　C. the basic materials of cells will last forever

　　D. human organs can be repaired by new medicine

　　34. We can learn from the passage that___________.

　　A. human life will last more than 120 years in the future

　　B. humans have to take medicine to build new skin cells now

　　C. much needs to be done before humans can have a longer life

　　D. we have already solved the technical problems in building new cells

　　B

　　Erica David lives in Pinedale,Wyoming，USA，where winter can bring temperatures

　　of below 35 degrees Fahrenheit，howling winds，and a lot of snow．So it was just natural that she chose to study snow for her school science fair in the sixth grade．

　　Now a junior in high school，Erica is in her sixth year of snow experiments，and is well on her way to becoming a snow expert．She started with a basic question：Could snow fences be built to work better?

　　Snow fences are used to keep snowdrifts（雪堆）from covering areas like roads of train tracks，or to help build up snow where it can help with water shortages in spring when it melts（融化）．“Also，I wanted to protect my animals better from blowing snow，”says Erica，who raises goats，sheep，and pigs．

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