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What do you usually do in your free time? Last month we asked 100 students about their free time activities. Here are the results.
★①How often do you watch TV? | ★②How often do you surf the Internet?
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★③How many times a week do you exercise? | ★④How often do you help to do housework?
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1．How many students often watch TV?
| A．About 3. | B．About 24. | C．About 33. | D．About 40. |
| A．4% | B．22% | C．26% | D．48% |
| A．Reading. | B．Watching TV. | C．Exercising. | D．Doing housework. |
| A．①③. | B．①④. | C．②④. | D．③④. |
| A．They did the survey among 200 students. | B．The survey is about students’ study. |
| C．About 27% of the students exercise once or twice a week. | D．Four students never do housework. |
同类型试题
y = sin x， x∈R， y∈[–1，1]，周期为2π，函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x， x∈[–1，1]， y∈[–π/2，π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2
y = sin x， x∈R， y∈[–1，1]，周期为2π，函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x， x∈[–1，1]， y∈[–π/2，π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2
