川贝母
参考答案：
百合科植物川贝母、暗紫贝母、甘肃贝母或棱砂贝母的干燥鳞茎。前三种习称松贝，后者称炉贝。
With the help of the high technology, this year the factory has produced ________ it did last year.
A．twice as many as
B．twice as many cars as
C．twice as many as cars
D．twice cars as many as
我国高新技术产品出口最好的领域是航空科技。
