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This is an old story about a crow.
It is very hot and dry in the desert. The sun is shining all day. A crow is very thirsty. Suddenly he sees a jar with a little water. The mouth of the jar is too small and his beak can't reach the water. He thinks hard and later he has a good idea. He collects little stones and drops them into the jar one by one. The water in the jar rises and rises. At last, he is able to drink the water. How clever he is!
( )（1）It is very hot in the desert.
( )（2）A crow is very hungry and wants to find something to eat.
( )（3）There is a jar with a lot of water in the desert.
( )（4）The crow drops many little stones into the jar.
( )（5）In the end the crow is not thirsty.
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
