“50年代淘米洗菜,60年代洗衣灌溉,70年代水质变坏,80年代鱼虾绝代,90年代身心受害”。这首反映淮河流域水质变化的民谣主要说明 A、该地区
One of the most popular items (项) in the school newspaper is the advice column (专栏).Here are some of the questions asked and their answers -- Q: I'm always late for school.I try not to be la
若函数f(x)=单调递增,则实数a的取值范围是( ) A. (,3) B. [,3) C. (1,3) D. (2,3)
根据反应:2H2S+O2=2S↓+2H2O、4NaI+O2+2H2SO4=2I2+2Na2SO4+2H2O Na2S+I2=2NaI+S↓,判断下列物质的氧化性强弱,正确的是: ( ) A.O2>I2
The strict teacher often makes______ very tired. A.we B.our C.us D.ours
可持续发展是我国社会发展的必由之路,在西部大开发中要特别注意生态环境的保护。据此完成18~19题。 18.青海湖的水位近年来持续下降,著名的“鸟
I graduated from a small public school in Michigan. One day,Mr. Ledy,our football coach,asked me to play football. I couldn’t help 36 :me,play football? I was six feet tall and was