下图是一辆自行车，主动轮有36齿，从动轮有18齿，后轮直径为65厘米，如果每秒蹬9圈，则这辆自行车的速度为()千米/小时。
A. 9.6
B. 24
C. 28.8
D. 31.2
“没有完美的个人，只有优秀的团队。”“光队长一个人不行，要大家行才行。”这强调的是()。
A. 爱岗敬业，精益求精
B. 公事公道，一事同仁
C. 团结协作，互帮互助
D. 遵实守信，服务群众
It is implied in paragraph 1 that nowadays homework______.
A. is receiving more criticism
B. is no longer an educational ritual
C. is not required for advanced courses
D. is gaining more preferences
According to Paragraph 2, which of the following is true of colours？
A. Colours are encoded in girls' DNA.
Blue used to be regarded as the colour for girls.
C. Pink used to be a neutral colour in symbolizing genders.
D. White is preferred by babies.
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