题目内容：

    A shark moving around the coastline is normally a worrying sight，but this waterborne drone(无人机)threatens floating rubbish instead of people.

Developed by Dutch company RanMarine, the WasteShark takes nature as its inspiration with its whale shark-like mouth. Responsible for collecting waste, the drone will begin operations in Dubai Marina in November after a year of trials with local partner Ecocoast.

According to RanMarine, the WasteShark is available in both autonomous and remote-controlled models. Measuring just over five feet by three-and-a-half feet(1.5 meters by 1.1 meter)，it can carry up to 352 pounds of rubbish(159.6 kg)and has an operational battery life of 16 hours.

By 2016 there were approximately 150 million tons of plastic in the world's oceans. One paper from December 2014 estimated that over a quarter of a million tons of ocean plastic pollution was afloat.

"WasteShark also has the abilities to gather air and water quality data, remove chemicals out of the water such as oil，and heavy metals，and scan the seabed to read its depth and outlines，"said Oliver Cunningham, one of the co-founders of RanMarine. "Fitted with a collision-avoidance system, the drone uses laser imaging detection and ranging technology to detect an object in its path and stop or back up if the object approaches."

"Our drones are designed to move through a water system, whether it's around the perimeter(周边) or through the city itself. The drones are that last line of defense between the city and the open ocean," added Cunningham. "WasteSharks are operating in Dubai, South Africa and the Netherlands and cost $ 17,000 for the remote-controlled model and just under $ 23,000 for the autonomous model."

Dubai-based operator Ecocoast has two WasteShark drones. Co-founder Dana Liparts says they will clean waterfronts for clients including hotels and environmental authorities and that Ecocoast' intention is to have the collected rubbish recycled or upcycled. However, Liparts argues that cleaning waterways doesn't have a one-size-fits-all solution and requires a combination of new technology, preventative measures and changing people's attitudes towards littering.

1.What do we know about the WasteShark?

A. It can frighten sharks away. B. It is an ocean explorer.

C. It is a rubbish collector. D. It can catch fish instead of people.

2.What does Paragraph 4 mainly tell us?

A. The causes of ocean pollution. B. The dangers of using plastics.

C. The severity of ocean garbage pollution. D. The importance of ocean protection.

3.What will the WasteShark do with an approaching object?

A. Avoid crashing into it. B. Break it into pieces.

C. Swallow it. D. Fly over it.

4.Which of the following ideas does Liparts agree with?

A. The WasteShark should be used more widely.

B. More measures should be taken to make water clean.

C. The production cost of WasteSharks should be reduced.

D. People should take a positive attitude to new technology.