阅读下面短文，请根据所给中文正确拼写单词，使意思完整，每空限填一词。

My brother and I are having our 1.________( 冬天 ) holiday. Yesterday we visited the museum. We got there by bus. And then we climbed the 2._________( 山) .At noon , we 3___________( 步行 ) to the restaurant to 4._________( 吃) lunch. The food was delicious. It was cheap, 5.________( 也 ). We 6._________( 去 ) shopping in  the afternoon .  I bought a 7.______(围巾).We returned to the hotel very 8.________(晚)but I didn’t feel (感觉) very tired. Today we have a 9.______( 新 ) idea( 注意). We’ll go skating tomorrow. I am 10.________( 肯定 ) we’ll have a very good time.

以下除哪项外都是构成地道药材的因素

A．毒副作用低
B．疗效突出
C．历史悠久
D．地域特点
E．产量大、品种优良