With the country’s population reaching 1.6 billion in the mid of this century, most of China’s rivers, including the Yellow River, ________.

A．is drying up

B．will be drying up

C．dry up

D．have dried up

中华人民共和国药典属于

A．一次文献
B．二次文献
C．三次文献
D．主动的药物信息服务
E．被动的药物信息服务