Fly with feet
带着脚飞
Choose the answer:
1. What can we learn about drones with robotic claws from Paragraph 2?
从第2段中，我们可以了解到哪些关于带有机器爪子的无人机的信息？
They are useful in forests.
它们在森林里很有用。
A. They cannot fly for long hours.
它们不能长时间飞行。
C. They need lots of power to work.
他们需要大量的电力才能工作。
D. They have to stay away from birds.
他们必须远离鸟类。
【原文： If the drone is helping people collect data in forests, for example, they can stand on tree branches instead of flying all the time. This saves lots of power . 例如，如果无人机帮助人们在森林中收集数据，他们可以站在树枝上，而不是一直在飞行。这节省了大量的电力。 】
2.According to Paragraph 3, scientists used high-speed cameras to
根据第3段，科学家们使用高速摄像机
study how birds take off and land
研究鸟类是如何起飞和降落的
A. collect data about forests
收集有关森林的数据
B. record the sizes of different tree branches
记录不同树枝的大小
D. find out how drones work in the rain
了解无人机如何在雨中工作
【段落首句原文：Making drones' fly and land like birds is not easy. 让无人机像鸟一样飞行和着陆并非易事。】
3.What does the word " grab" mean?
“grab”这个词是什么意思？
答案：C.to hold 按住
A. to fly飞行
B. to print打印
D. to fall堕落
【原文：Once the drone grabs the branch, the balancing system starts.一旦无人机抓住树枝，平衡系统就会启动。】
4. How do birds balance themselves on a tree branch?
鸟类如何在树枝上保持平衡？
By tilting their bodies forward.
通过身体向前倾斜。
A. By having soft toe pads.
通过使用柔软的脚趾垫。
B. By curling their claws.
通过卷曲它们的爪子。
C. By opening their wings.
通过张开翅膀。
【原文： It tilts the drone forward so that the drone won't fall, just like real birds.
它将无人机向前倾斜，这样无人机就不会坠落，就像真正的鸟一样。 】
5.What can we learn from the story?
我们能从这个报道中学到什么？
Drones with claws might help scientists do more things.
带爪子的无人机可能会帮助科学家做更多的事情。
A. Drones have difficulty balancing
themselves while flying.
无人机在飞行的时候很难保持平衡。
C. Scientists will 3D-print robotic claws for birds without feet.
科学家们将为没有脚的鸟类进行3D打印机器爪子。
D. Scientists will use real birds to study the natural environment.
科学家们将使用真正的鸟类来研究自然环境。
