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John and Bob are in the same class. They are good friends. Last year they spent (度过) the summer holiday together. One day, they wanted to get up early to go fishing, but they didn’t have an alarm clock (闹钟). “Oh, it’s easy, I’ll put some pieces of bread on the windows of the house, and they’ll wake us up in the morning.” said Bob. John was surprised (吃惊). Early the next morning, some birds came down to eat the bread, and they woke John and Bob very quickly.
1．John and Bob are in different classes.2．John spent the summer holiday with Bob.
3．They wanted to swim one day.
4．They had an alarm clock.
5．The birds woke John and Bob up early in the morning.
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
