太阳能热水器 (1)

科学60秒:牡蛎味鲜美 环保价更高

The Chesapeake Bay could get helped by a new antipollution expert: farmed oysters. For decades, the Chesapeake has been ___1___ by excess nutrients, such as nitrogen, from agricultural and munici...

科学60秒:医生昏昏欲睡 手术患者担责

Over the years ____1____ limit the hours of hospital interns and residents. Because someone putting in a 100-hour workweek might not be at their best when deciding which medication to prescribe o...

政治：泰国内乱

政治：泰国内乱Heading overseas to Thailand where grenade attacks in the capital city of Bangkok have killed at least three people. A Thai official said the grenades came from an area where people

远离乳腺癌 (1)

Ynte Schukken Cornell University Ithaca Cows, sheep, goats and other animals can get mastitis, an inflammation in the udder, the organ where milk is produced. Milk from an untreated cow is still...