搜索
Let me tell you something about sharks. Sharks are among the oldest animals in the world. There are over three hundred fifty different kinds of sharks in the world. Most sharks are about two meters long and live in the oceans.
A shark can smell something in the water, for example, the blood of animals. That helps them find their food. Sharks mainly eat fish, other sharks and plants in the ocean.
Most sharks bite (咬) people by mistake. They think a person is a large sea animal. When the sun goes down or comes up, sharks are looking for food. So at these times people shouldn't go swimming in the ocean.
Today people kill sharks for food and their skin. The number of sharks in the world is dropping fast.
1．How many kinds of sharks are there in the world?| A．Less than 350. | B．More than 350. | C．About 200. | D．Over 400. |
| A．Fish, other sharks and plants. | B．Fish and plants. |
| C．Other sharks and plants. | D．Fish and other sharks. |
| A．Because they think a person is dangerous. |
| B．Because they think a person is a large sea animal. |
| C．Because they think a person can hurt them. |
| D．Because they think a person can take away their food. |
| A．Sharks are everywhere at those times. |
| B．Water is cold then. |
| C．Sharks are looking for food then. |
| D．Sharks are looking for a person then. |
| A．It is dropping fast. | B．It is rising fast. |
| C．It is not changing. | D．We don' t know. |
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
