搜索
| name | do homework | help mother | walk to school | wear dresses |
| Ella | A | O | N | A |
| Steven | S | N | S | N |
| Bill | O | S | O | N |
| Tom | N | N | A | N |
| A—always O—often S—sometimes N—never | ||||
1．Bill ________ walks to school.
2．Steven ________does his homework.
3．How often does Ella do her homework?
____________________________________________
4．Who never wears dresses?
_____________________________________________
5．How often does Tom help his mother?
______________________________________________
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
