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Jack: Wow! Who are they?
Dick: They are my new friends in China. The little girl is Nancy. She is riding a bike.
Jack: What is that boy doing?
Dick: Oh! He is playing with a yoyo.
Jack: What is a yoyo?
Dick: It's a kind of ball.
Jack: Who is the man over there?
Dick: He is my maths teacher. He is talking to his friends.
1．Jack is Dick's new friend in China. （
2．Nancy is riding a bike. （
3．The boy is playing with a kind of ball. （
4．Dick's Chinese teacher is talking to his friends. （
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
