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Today is Sunday. The sun, is shining. The Chens are at the beach. They are having a good time at the beach. Look, Mr Chen is sailing his boat. Mrs Chen is tired. She is sitting under the umbrella. She is having a. rest. His daughter, Lucy, is reading a book, she likes reading. Look, Ben is collecting shells. There are all kinds of shells at the beach. How many shells are there? One, two, three… there are twelve shells near him. They are happy!
1．There are three people in Lucy's family.（
2．It is Saturday today.（
3．Ben has got twenty shells.（
4．Lucy likes reading, but she can't read a book.（
5．Mr Chen is tired, he's sailing his boat.（
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
