Questions 29 and 30 are based on the following news. At the end of the news item, you will be given 10 seconds to answer the questions. Now, listen to the news.

The percentage of the annual decrease in infant mortality rate since 1990 is

A．By good sense of taste.
B．By good sense of smell.
C．By good visual sense.
D．By good sense of hearing.

A．can possibly give people better feelings.
B．increases production by 4.5 percent in factories.
C．is sometimes very boring for workers.
D．is always faster than any other music.