Read the fairy tale Cinderella and answer the questions.

Once upon a time there was a young girl called Cinderella. Cinderella was living happily with her family when her mother died. Her father married an evil widow with two daughters. Cinderella’s stepmother and two stepsisters mistreated her. She had to wear old clothes and work hard while the sisters wore fancy clothes and had fun. A good witch helped Cinderella. She turned Cinderella’s old dress into a beautiful gown. Cinderella went to a party and a handsome prince politely invited her to dance with him. He fell in love with her and wanted to find out who she was. Cinderella left the party in a hurry and didn’t tell the prince her name. But she left a glass slipper, and the prince used that to find her. They got married and lived happily ever after.

What happened in the end?

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Cho y = x 3 − 3 x 2 + m . Khi đó số giá trị nguyên của m để hàm số có 5 điểm cực trị?

A. 3

B. Vô số

C. 0

D. 5

Read the passage then answer the questions

   Vietnam’s New Year is celebrated according to the lunar calendar. It is especially known as Tet Nguyen Dan, or Tet. It begins between January twenty- first and February nineteen. The exact date changes from year to year. Vietnamese people usually make preparations for the holiday several weeks beforehand. They tidy their houses, cook special food, clean and make offerings on the family altars. On the New Year’s Eve, people sit up to midnight to see New Year Eve, then they put on new clothes and give one another the greetings of the season. Tet lasts ten days. The first three days are the most important. Vietnamese people believe that how people act during those days will influence the whole year. As a result, they make every effort to avoid arguments and smile as much as possible.

Question: Why are the first three days the most important?

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Nước cứng là nước có chứa nhiều các cation nào sau đây? 

A. Na⁺ và K⁺.

B. Ca²⁺ và Mg²⁺.

C. Li⁺ và Na⁺.

D. Li⁺ và K⁺.