单项选择题
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.
A. how B. why C. what D. that
A. the size of the workforce is becoming larger B. the population of the UK has been on the rise C. the workers of the UK are much younger than before D. the average number of children in British family is falling