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问题 填空题

同类项合并法则：合并同类项后，所得的项的系数是（    ）。

答案

合并前各同类项的系数的和且字母部分不变

阅读理解
Read and answer the questions. 阅读短文内容，回答问题。
       I'm Betty Smith. I'm ten years old. I study in Rudyard Kipling School in Washington, D.C., the U.S. I 
want to go on a trip to China. And I want to go to Beijing! It's the capital city of China. I know it's 11,151 
kilometers from Beijing to Washington, D.C.. Here is my travel (旅行) plan.
Date (日期) PlanDate (日期) Plan
Dec. 20th-Dec. 21st fly to BeijingDec. 24thGreat Wall (长城)
Dec. 22ndTian'anmen Square Dec. 25thgo shopping
Dec. 23rdthe Palace Museum Dec. 26thgo back to the U. S.

1. Does Betty live in the U. S.? 
                                                                                         
2. How far is it from Beijing to Washington, D. C. ? 
                                                                                         
3. When is Betty going to arrive in Beijing?
                                                                                         
4. Where is Betty going to visit (参观) on December 23rd? 
                                                                                         
5. Do you want to go to the U. S. to see the Statue of Liberty?
                                                                                         

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问答题 简答题

简述执票人在行使追索权时候必须具备的条件。
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