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Sarah: My schoolbag is heavy.
John: What’s in it?
Sarah: Look! Seven storybooks, four pencils, five rulers, six erasers and three pencil boxes.
John: Wow!
Sarah: What’s in your schoolbag?
John: Look! Four storybooks, two pencils, one ruler, one eraser and one pencil box.
Sarah: Oh, your schoolbag is not heavy.
1．Sarah has 7 storybooks in her schoolbag.
2．John has 9 rulers in his schoolbag.
3．Sarah has 5 erasers and 2 pencils.
4．Sarah’s schoolbag is heavy.
5．John’s schoolbag is heavy.
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
