单项选择题 Smoking cigarettes adds to the general levels of air pollution as well as damaging our health（）

单项选择题 The program we will watch is an English teaching TV program divided into 40 episodes, each of which has five acts（）

单项选择题 In my recent trip to California，virtually all leading book stores and public libraries were well-stocked with plenty of publications on China，the mysterious oriental country．（）