What does the passage say about great mathematicians？
A. Their teachers did not supply answers to them.
B. They started learning mathematics at an earlier age.
C. They showed mathematical abilities in their teenage years.
D. Their success results from their strong interest in mathematics.
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What are boys usually encouraged to do at school？
A. To get help with their homework.
B. To play the leading role in class.
C. To work with girl students in class.
D. To learn to take care of others.
函数y=xex单调减少区间是
A. (-∞，0)
B. (0，1)
C. (1，e)
D. (e，+∞)
Which of the following statements is true？
A. Nadia was better at maths than other students.
B. Nadia found some of the maths questions difficult.
C. Nadia was encouraged to answer questions in class.
D. Nadia understood the maths teacher better than other teachers.
What is the message of the story？
A. Talking about something familiar gives you confidence in communication.
B. Answering questions in class makes you better understood by classmates.
C. Language plays an important role in communication between cultures.
D. Mathematics helps to improve communication between cultures.
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