《水浒传》有着极其丰富的思想内容，它揭露了封建统治阶级的罪恶，挖掘了农民起义的社会根源。
参考答案：对
20．It was four o'clock in the afternoon_____he and his grandpa reached the museum in Guanghan, _____an official warmly received them.
A．that; where
B．when; that
C．when; where
D．that; when
自然保护区的内部未进行分区的，依照《自然保护区条例》应按有关( )的规定管理。
A．核心区 B．实验区 C．缓冲区和实验区 D．核心区和缓冲区
