问题
单项选择题
食管清除作用不包括（）。
A．食管自发蠕动
B．食管继发性收缩
C．容量清除
D．一过性食管下括约肌松弛
E．唾液缓慢中和
答案
参考答案：D
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食管清除作用不包括（）。
A．食管自发蠕动
B．食管继发性收缩
C．容量清除
D．一过性食管下括约肌松弛
E．唾液缓慢中和
参考答案：D
In the USA, books that tell how to do things are very popular today. Thousands of these “how to” books are selling __ in bookstores. In fact, there are about four thousand books with names that____the words “how to”. One book may tell you how to _ money, another may tell you how to spend it, and another may say how to give your money away. Many “how to” books tell you how to__ They tell you how to choose a job and how to do it well. __ if you fail to get a job, you can buy a book called “how to__ _ money”. If you__ make any money at all, you may need a book with a name“how to live on nothing”. Why do many of these books__ so popular? It is because life has become hard today and people have far more__ to face. “How to” books people live through the modern life.
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