There is a big forest zoo in the Dalian. There are lots of animals. Tigers are twenty. Lions are ten. Bears are twelve. Wolves are thirty. How many wild (野生的) animals? It’s seventy-two. Do you know the numbers about the animals?
1.How many wild animals? ( )
A.eighty | B.seventy | C.seventy-two |
A.20 + 10 = 30 | B.20 + 12 = 32 | C.20 + 30 = 50 |
A.10 + 30 = 40 | B.12 + 30 = 42 | C.20 + 30 = 50 |

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

