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There are three schoolbags on the table. The red one is Lily's. It is big and nice. It has got four wheels. It is easy for her to carry. The yellow and black one is Lingling's. It's small, but it has four pockets（口袋）. She always puts her umbrella or bottles in them. They are very useful（有用的）. The blue one is Daming's. It's got four wheels, too. It's not too big or too small. Daming can carry it easily.
1．How many schoolbags are there on the table?2．Whose schoolbags have got four wheels?
3．Is it easy for Lily to carry her schoolbag?
4．What are very useful?
5．Whose schoolbag is not too big or too small?
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
