Questions 30 to 32 are based on the passage you have just heard.

A．His friend is looking for more than an apology.
B．He couldn’t find the right words to apologize.
C．He will try to make an apology again.
D．He shouldn’t have made an apology.

A．Because human beings are powerful enough to kill one another.
B．Because every species will become extinct by natural selection.
C．Because there is over-population that will make the earth explode.
D．Because human beings are a young species, exploiting their environment.