单项选择题
Questions 21 to 23 are based on the following news. At the end of the news item, you will be given 15 seconds to answer the questions.
What is the news item mainly about(). A. The U.S. charity, Save the Children, in Vietnam.
B. Improving maternal and child health in the world.
C. Reducing the number of childhood deaths in South Asia.
D. High infant and maternal mortality in developing countries.