Questions 27 and 28 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.

Developed countries take ______ of the world’s health expense.

A．Forthcoming improvements on the Internet.
B．Chinese characters on the Internet.
C．Delivery of emails on the Internet.
D．Different languages on the Internet.

A．To examine whether these children were healthy.
B．To find out whether their mothers had smoked.
C．To find out why these children suffered breathing problems and lung disease.
D．To look into the effect that mother’s smoking had on their children.