气虚便秘的特点是
A．大便不干硬，排便困难B．大便干结，面色无华C．大便干或不干，排出困难D．大便干结，伴潮热盗汗E．以上皆非
参考答案：C
Parents often have their children_____ little housework so that they can have more time______.
A．doing; studying
B．done; studied
C．to do; to study
D．do; to study
外伤性白内障
