口语交际
A：Hi, Mike, _______
B:  Yes ,Ido. It’s more than 6 billion.
A:  Wow, that’s large! _______
B:  Yes.It will reach about 9 billion by 2050.
A: ___________
B:  It’s going to be bad. _____.   We won’t have enough food,water,or energy in the future.
A; _________
B:  Yes, it is.Governments all over the world are working to solve the problem.
A:  I hope the population of the world won’t grow so fast.
B:  Me ,too.