A new curriculum standard(课程标准) for pupils is made in China. There are different lessons for students from different grades.

Students in first and second grades need to do some cleaning, wash vegetables and fruits, and learn to plant one or two kinds of plants or feed small animals.

Third and fourth graders should clean their classrooms, wash their clothes, socks and shoes, know how to make cold dishes(菜肴).

In fifth grade and sixth grade, students should learn cooking two or three common dishes—dishes we can see in many places, such as scrambled eggs with tomatoes(西红柿炒蛋).

Teachers, parents and students have different ideas about it. Teachers feel happy. They think it can bring some color to their life. Parents think the same. Only students may feel a little sad, because they have to learn more.

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1. What does the underlined word “common” mean?（词义猜测）

A    Difficult.

B    Special.

C    Favorite.

D    Usual.