l.C【解析】细节理解题。根据第二段“From caringfor Jesse,he learns to understand better his own painand what brings meaning to one's life.”可知，强尼从...

4.C【解析】：函数)y=x-1)的定义域为[3]，是≤x1.综上，a≥1.故选A.△=a2-4(a-1)≥0 10.BC【解析】要使f(x)=√一x2+2x+3有意义，则有一x2+2x十3≥0，解得一1≤x≤3，...