【简答题】根据句意首写字母填单词。 1. It's a ________ (秘密) between you and us. Don't tell anybody about it. 2. As students, it's our d________ to study hard at any subjects. 3. My grandfather died last month. His d________...
【简答题】import from import ,from import ________, import as
【单选题】From the 1870s on, it is impossible to import plants from North America.
【单选题】空间两点 A 、 B 在 W 面上的投影重合在一起,表示为 a’’(b’’) ,则 A 、 B 两点的相对位置是