化学是一门自然科学，研究和发展化学科学的基础是（   ）

    During holidays，Kitty usually goes to see the exhibits in many museums，such as the history museum，the art museum，the museum of science and technology and the museum of natural history．There are thousands of wonderful things in museum.There are paintings，sculptures(雕塑)，costumes(服饰)，swords(剑)，ancient animal bones and plants，stuffed animals(动物标本)and many others．It is always a good review of history to visit those museums．It is also a great way to learn more things by myself．

如果一个水平放置的图形的斜二测直观图是一个底面为$45°$，腰和上底均为1的等腰梯形，那么原平面图形的面积是（   ）