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

由于委托专业的市场调查与预测机构需要支付一定的费用，因此在需要开展市场调查活动时应尽量由企业内部人员自行调查。