It is Saturday today. It is
When he begins (开始) to do his homework, his dog
It's lunchtime (午餐时间) now.
A.snow | B.rain | C.sunny |
A.doing | B.does | C.do |
A.want | B.wants | C.wanting |
A.coming | B.come | C.comes |
A.mouth | B.tail | C.arm |
A.a | B.an | C.some |
A.sing | B.singing | C.sang |
A.at | B.to | C.for |
A.glad | B.interesting | C.worried |
A.What | B.Who | C.When |
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