题干

玩具车间每天能生产甲种玩具零件24个或乙种玩具零件12个,若甲种玩具零件一个与乙种玩具零件2个能组成一个完整的玩具, 怎样安排生产才能在60 天内组装出最多的玩具?设生产甲种玩具零件x天 乙种玩具零件y天,则有(         )

A:x+y=6024x=12y

B:x+y=6012x=24y

C:x+y=602×24x=12y

D:x+y=6024x=2×12y

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C

同类题1

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    One student took a box of chicken to class. Another carried on a cell-phone1and still another whistled loudly every time the2turned his back. Reform school? No. College.

    More and more, professors say, they are3 across rude students in their classrooms. Many of today's young scholars arrive late, leave4talk loud or take care of personal 5such as paying bills during class.

    Why are the students behaving badly?  “Because they can,” said a student of University of North Texas. “A lot of the time, the professors 6them get away with it.”

    Some educators say it is time to bring politeness back to their classrooms—and even7taking some of the blame for bad behavior. They say that8 students are by no means the majority but that one of them can ruin an entire9

    People are10when they learn that impolite behavior is becoming more and more common in11education, says Dr. Gerald Amanda, a counselor at City College of San Francisco. They12some high school students to misbehave but think those who get to 13 will behave more politely.

    Dr. Amanda believes that society in 14 has become more tolerant of rude behavior 15 that people in power, including professors, no longer 16 standards for politeness. That leads to a growing imprudence among some college17“There's a great18 of bad behavior in the world around them, and young people see it and19 disrespect,” said Dr. Amanda20that sometimes students have no idea that they are being rude.

同类题3

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    “I don't feel right about this,” I said to one of my cousins in a low voice. She nodded in 1 . Not wanting to be the first to touch the food, I waited for one of the older adults to start.

    Thanksgiving usually meant 2  and full stomachs, however, this year was 3. My family sat around the dinner table 4 at our feast. Everyone had a full plate, everyone except for Grandma. The treatment for throat cancer would 5  one of her great pleasures, eating. This was the first 6of many food-focused 7  to come. I could not imagine what it would be like to never taste food again. My cousin Molly broke the 8 with a raise of her glass, “To Nat.” We all followed her lead. “Your 9 and strength encourage us all,” she continued. Grandma smiled, holding back her tears with great 10 . “Thank you. Please, please eat.” And with that, we all began to eat. Conversation broke 11around the room while Grandma laughed and talked with us all. Cancer would take away her ability to eat, but not the gift of being the best hostess. The evening went on as 12 Thanksgivings do. By the time the night was over, I felt 13 to my family than ever before. I learned that we gather together on holidays not to eat rich feast, but to 14 and share with one another. We 15 my Grandmother's courage, but we all learned a lesson in grace. In the years following, my Grandma 16 to create meals for family events. She told me once with a laugh, “I may not be able to eat, but I can 17 taste things.” With a 18 heart, Grandma prepared what she could not have for the only purpose of making us 19 . She inspired me to learn to cook and helped me find the 20 to make everything come together: love.