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The students of Grade 6 from Sunshine School are doing a project. They have been collecting empty(空的) bottles In June, they are going to take them to a recycling centre. They re going to sell(卖) the bottles and buy some books for the school library.
Kate drew a graph(图表). It shows the numbers of the bottles they have collected. Here is the graph.
1．The students have collected empty bottles for one year.2．They collected 40 more bottles in December than(比) in January.
3．They collected the same(相同的) bottles in September and April.
4．The students wanted to play with the empty bottles, so they did the project.
5．The students of Grade 6 are not clever because the bottles they collected were empty.
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
