was，speak，so angry，he，my father，could hardly，that (连词成句）

生产部经理：本厂生产的建筑材料虽然达到了国家现有质量标准，但严格地说，还存在某些安全隐患。目前的新技术使得我们已经能生产具有更高安全性的同类产品。因此，为了确保安全，应该停止生产旧产品，只生产和销售新产品。
销售部经理：我不完全同意你的意见。要推广新技术，批量生产新产品，需要大量资金。如果停止销售已有的旧产品，则无法筹集足够的流动资金。
以下哪项最为准确地概括了两人争论的焦点（　　）

We're making a model plane.(改为一般疑问句)

Are____making a model plane?

阅读短文，选择正确答案。

    The bell rings (响). Mr. Wang goes into Class Three and wants to give an English lesson. At this time Mr. Zhang comes and asks him to attend (参加) an important (重要的) meeting. So Mr. Wang says to his students, "Study by yourselves, please."

     When Mr. Wang comes back,he sees Zhao Yang talking with his desk mate Li Cheng.

   “Stand up, Zhao Yang," says Mr. Wang, "What are you doing?"

    "I'm reading English," says ZhaoYang.

    "What's in your hand?" says Mr.Wang.

     ZhaoYang looks at his hand. It's a history book.Then he looks at Li Cheng. There is an English book in his hand. So he says, “Sorry, Mr. Wang. We are studying the history of England."

如图所示，重20N的物体放在粗糙水平面上，用F＝8N的力斜向下推物体．F与水平面成30°角，物体与水平面间的动摩擦因数μ＝0.5，则(　　)