A：x2+2x+1=0
B：x2+x+2=0
C：x2﹣1=0
D：x2﹣2x﹣1=0
— What's the matter? You are crying!
— Nothing serious. The film ________ me ________ the times when I was a child.
一般情况下，生态系统中各种生物的____ 和所占的比例是相对稳定的，这说明生态系统具有一定的____ 能力．
—Could you please offer me a job in your company?
—Sorry，I'm afraid it's beyond my________.
