艾滋病病毒 (1)
提示: Monica Sweeney
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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:全球变暖是谣言?!
Congress has finally acted on global warming—by denying it exists. It’s in the grand lawmaking tradition of the Indiana state legislature’s 1897 attempt to ___1___ the value of pi. The Republ...
降温时保持花草树木暖和(1)
气温下降时作物和树木的保暖Hints:Floridathe Sunshine StateBrazilArctic Air Florida, in the southeastern United States, is called the Sunshine State. It grows more oranges than anyplace except Bra...
战火纷飞伊拉克(1)
由于连年战乱和经济困难,联合国预计超过六百万的伊拉克人民急需帮助...The United Nations estimates up to six million people in Iraq are in dire need of help because of years of violence and economic...