香烟禁令与酒吧生意 (1)

科学60秒:声带成就百兽之王

For many potential entrée animals this (LION ROAR) is one of the scariest sounds around. Scientists long thought the lion’s distinctive roar___1___thick layers of fat inside the vocal cords. Bu...

科学60秒:邮件传播谣言，威力无穷

During the 2008 presidential election, the Internet became a giant rumor mill. For example, there were the ___1___ claiming that Barack Obama’s birth certificate was a fake. Or ones spreading th

科学60秒:进化论革命尚未成功，生物老师仍需努力

High school students ______1_____ biology might take some consolation in knowing that most of their teachers would be, too.So suggests a commentary in the January 28th issue of the journal Scienc

20国集团领导承诺采取措施复苏全球经济 (1)

Leaders of the world's largest rich and developing economies met Thursday in London. The Group of 20 agreed to an additional trillion dollars for the International Monetary Fund and other lenders...