从外单位取得的原始凭证，必须盖有填制单位的公章，并应具有防伪标志和国家有关管理机关的监制章。( )
参考答案：对
尽量购买无需包装、（）或（）的商品，不买过度包装或小包装的商品。
句型转换.
1. She does her homework at home. (改为否定句)
She her homework at home.
2. He's reading when it is raining. (就画线部分提问)
he when it is raining?
3. How's the weather in Beijing? (改为同义句)
the weather in Beijing?
4. I'm having a great summer in London. (改为一般疑问句并作否定回答)
you a great summer in London?
No, .
5. It's cloudy today. (就画线部分提问)
today?
