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Not too long ago, Singapore seemed to have brought the coronavirus(冠状病毒) under control. However, a second wave hit. The government had to make stricter lockdown rules as a result. For visitors to Bishan-Ang Mo Kio Park, these new rules may see them receiving a warning from an unusual dog.

The dog, called Spot, is a four-legged robot. It works around the area with a park worker. It plays a recording that tells visitors to “stand at least one meter apart.” The robot has cameras. They are used to know the number of visitors in the park. Unlike wheeled robots, Spot can walk on different surfaces. That makes it suitable for public parks. The robot also has sensors so that it won’t hit anything within one meter of itself.

If everything goes well, Spot may work in other public places in the future. When an eye-catching robot dog tells you to keep your distance, it is hard not to listen.

1.Why did the government make stricter lockdown rules?

A Because Singapore controlled the coronavirus.

B Because a lot of people went out every day.

C Because more and more people began to fall ill.

D Because a second wave of the coronavirus hit Singapore.

解析：选D。细节理解题。根据第一段第二、三句However, a second wave hit. The government had to make stricter lockdown rules as a result.可知由于新冠病毒的第二波袭击，新加坡政府不得不制定更加严格的封城措施，故选D。

2.What’s the unusual dog?

A It’s a real dog.

B It’s a four-legged robot.

C It’s a park worker.

D It’s a police officer.

解析：选B。细节理解题。根据第二段第一句The dog, called Spot, is a four-legged robot.可知这条不寻常的狗是一只有四条腿的机器狗，故选B。

3.Paragraph 2 mainly tells us _______.

A when the dog was made

B where the dog was made

C how the dog worked

D the name of the dog

解析：选C。细节理解题。根据第二段的介绍可知这段主要讲的是这只狗是如何工作的，故选C。

4.What does the underlined word “they” refer to?

A Park workers.

B Visitors.

C Cameras.

D Wheeled robots.

解析：选C。词义猜测题。根据第二段所在划线词上文The robot has cameras.可知，这个机器狗装有摄像头，它们被用来了解公园游客的数量。they指的就是上文提到的cameras，故选C。