单项选择题
A. The study of social sciences. B. The study of natural sciences. C. The study of the subject matter of politics. D. The study of both social and natural sciences.
A. When we dare to challenge ourselves. B. When we feel it hard to change ourselves. C. When we are unconfident about ourselves. D. When we have a high opinion of ourselves.
A. The female lead. B. The clown. C. The painted face. D. The old lead.