“清明上河图”描述的城市是当今的哪个城市：
A．洛阳
B．南京
C．开封
D．杭州
参考答案：C
The novel is said _____ into many languages.
A．being translated
B．having been translated
C．to translate
D．to have been translated
反式作用因子和顺式作用元件的结合有哪几种结构模式？
