第3题: [单项选择]What do both theories assume to be true A. That new material is continually being formed. B. That, in time, the universe will contract. C. That the universe is expanding at present. D. That" a big bang" started the expansion. 参考答案:A 答案解析:[解析]由全文对两种理论对比看,B、C、D均不是两种理论共有的论点,只有A是。故应选A。