–Can I help you?
一Yes. I'd like to buy ____ eraser.
A：a
B：an
C：the
L____ of clean water means more and more people are getting ill.
已知（b+2）xb+1＜﹣3是关于x的一元一次不等式，试求b的值，并解这个一元一次不等式．
