单项选择题
A. They have a well-paid job. B. They don’t want to have children. C. They have their children at a much older age. D. They have no time to look after their children.
A. washington post B. Daily Mail C. the US federal government D. the Chinese central government
A. A dolphin is a special kind of fish. B. Dolphins can’t swim very quickly. C. Dolphins can live only in the sea. D. Dolphins produce their babies on land.