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B2 is a robot made to understand bat flight. The strength of flying made by the bats’ wings comes from a strong piece of skin. If you want to make a flying robot, said Science Focus, don’t copy bats. But B2 has very thin “skin” made of silicone（硅酮）. It flaps its wings and does sharp drops and turns, just like a real bat!
Walking with Cockroaches’ sticky feet
It has four legs instead of six, but this 4.5-centimeter-long cockroach（蟑螂）robot can walk and climb walls just like real cockroaches which have sticky（有粘性的）feet. The robot uses electricity to stick to walls. The tiny robot can look around inside engines because humans can’t go there.
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German scientists used magnets（磁铁）to move a 3D-printed guppy（孔雀鱼）around. The magnetic robot roller around under the fish tank. It copied the speed and direction of a fish partner, who thought the printed guppy was real. The team now use the robotic fish to better understand group actions in guppies.
1．What can we infer（推断）from Science Focus about flying robots?| A．Bats fly in a different way from some other flying animals. |
| B．People should not make a flying robot that flies like a bat. |
| C．Robots cannot fly without strong wings like bats. |
| D．Flying robots need a thin skin made of silicone to fly. |
| A．It only has four legs. | B．It can’t climb walls. |
| C．It can’t go into an engine. | D．It is made of silicone. |
| A．Printing beautiful guppies. | B．Copying guppies’ speed and direction. |
| C．3D-printed guppy moving around by magnet. | D．Rolling around guppies. |
| A．Animal World. | B．Science Study. | C．Culture Corner. | D．School Time. |
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
