A.he had prepared the topic before class B.he got frustrated with his first class C.he wanted to calm down the students D.he thought it was an easy topic
单项选择题5()
A.discovered B.exploded C.covered D.mastered
单项选择题The author concludes that historical changes would ().
A.take place if there were heroes to lead the people B.be delayed without leaders with inspiring personal qualities C.not happen without heroes making the necessary sacrifices D.produce leaders with attractive personalities