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根据下面所给的材料，以Bob’s family为题写一篇50词左右的短文，向你的同学介绍他的家人。
| name | age （年龄） | job | appearance and character （外貌与品行） |
| Bob | 12 | student | small, short ,clever |
| Bob’s father | 49 | policeman | big, strong, clever |
| Bob’s mother | 43 | cook | slim, nice, kind |
| Bob’s sister | 21 | nurse | tall, thin , kind |
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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
