一枚小小的邮票承载着丰富的历史信息。下面四枚纪念邮票反映的历史事件，标志着中国新民主主义革命开端的是
A．A
答案：B
Large quantities of water, as well as some other timely help including a medical team ___since the serious drought hit Yunnan Province.
A．has offered
B．had been offered
C．have been offered
D．is offered
多发性硬化在脑组织里的病灶多发生于
A．大脑白质
B．脊髓
C．脑室周围
D．脑干
E．视神经
