请指出在强心苷的化学结构中含羟基最少的药物（）
A.地高辛
B.洋地黄毒苷
C.西地兰
D.毒毛花苷K
E.黄夹苷
参考答案：B
房地产市场的运行环境，是指把房地产市场作为一个中心体，它的( )的总和。
A．一切因素
B．主体因素
C．客体因素
D．周围各种影响因素
根据要求变换句型。
1. Can you drive? (作肯定回答)
________, I can.
2. It's a hand. (变为复数)
They are ________.
3. There're ten chairs. (对划线部分提问)
________ many chairs ale there?
4. Tony has got a big family. (变为否定句)
Tony ________ got a big family.
5. The Pleasant Goat (喜羊羊) is from China. (对划线部分提问)
________ is the Pleasant Goat from?
