科學(xué)60秒:足球運(yùn)動員的"隱形殺手"

On February 17 former Chicago Bears football player Dave Duerson killed himself with a gun shot to the chest. Doctors later found that Duerson had a condition in common with more than 20 other ...

簡愛 聽力訓(xùn)練83

terrible adj. 可怕的，糟糕的，極度的The sky was blue and the birds were singing. "Now, Jane, what if there was a man who made a terrible mistake, years ago in a foreign county. For many years h...

黃石公園的老忠實噴泉

短文In Yellowstone National Park you can visit the geyser Old Faithful. It’s a spectacular sight, as each four-minute-long eruption sends boiling water over a hundred and fifty feet high. On ...