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Today (is /was) a fun day. I (walk/walked) to mike’s home in the morning. I (study / studied) English with him. We read / readed ) funny tongue twisters together.Then I (went /go) to a park (by / buy) bike. I (flew / fly)kites,
It (was / are) a windy day . Suddenly my kite flew into the lake.A dog (saw / see)the kite. He (jump / jumped ) into the lake and swam to it . Five minutes latter, he returned the kite to me .I was very grateful to him
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
