阅读下面短文，在空白处填入1个适当的单词或括号内单词的正确形式。

What species of dolphin is the smallest? Hector’s dolphin, Risso’s dolphin, Spinner dolphin【小题1】Dusky dolphin? The smallest dolphins【小题2】(be) Hector’s dolphins. They’re usually around four to five feet in length and 100 pounds in【小题3】(weigh).

And they are【小题4】(extreme) rare. You will only find Hector’s dolphins off the coast of New Zealand. And there’s a subspecies (亚种) of them called Maui dolphins【小题5】population has decreased to just a few dozen【小题6】(leave) in the wild. The biggest threat to Maui dolphins is when they’re caught【小题7】accident in the fishing industry. Disease, danger to their habitat and tourism【小题8】(suspect) in reducing their numbers, too.

But there’s a new eye in the sky and by that we mean a drone that aims to help Maui dolphins by locating, identifying and following them. The aircraft runs on electric and gas power. It’s estimated to cost $ 150. 000 and its aim is【小题9】(use) artificial intelligence technology to keep【小题10】eye on the 63 adult Maui dolphins that are still alive.