单项选择题
A. The classroom was under construction. B. He couldn’t focus on the class due to the noise. C. He felt that his studying was not effective. D. He went back to get the book left at home.
A、 fears of danger B、 the high estimate C、 political opponents D、 the coming danger
A、 civil wars reduced about 1000 000 people B、 the Augustan censuses included women and children C、 population explosion hypothesis is reasonable D、 some civil wars didn’t cause high casualties