Directions: Complete the following passage by using the words in the box. Each word can only be used once. Note that there is one word more than you need.

A tiger at the Bronx Zoo in New York City has tested positive for the respiratory disease caused by the novel coronavirus, becoming the first known case of human-animal 【小题1】, the zoo's chief veterinarian said on Sunday.

Nadia, the 4-year-old Malayan tiger that tested positive, was 【小题2】 for the COVID-19 disease after 【小题3】 a dry cough along with three other tigers and three lions, the Wildlife Conservation Society, which manages the zoo, said in a statement.

All of the cats are expected to recover, it said. But officials believe this is a unique case because Nadia became sick after 【小题4】 to an asymptomatic zoo employee, Paul Calle, chief veterinarian at the Bronx Zoo, told Reuters.

Calle said they did not know which employee infected the tiger. "This is the first time that we have discovered that a person infects the animal and the animal gets sick," Calle said, adding that they planned to share the findings with other zoos and institutions. " I guess 【小题5】 we will all have a better understanding as a result.

While the other tigers and lions were also 【小题6】 symptoms, the zoo decided to test only Nadia because she was the sickest and   had started to lose her appetite already, and they did not want to 【小题7】 all the cats to anesthesia(麻醉), Calle said.

Nadia 【小题8】 X-rays, an ultrasound(超声波) and blood tests to try to figure out what was making her sick . They decided to test for COVID-19 【小题9】 the surge in cases in New York City, the epicenter of the outbreak in the United States.The first tiger at the zoo, which has been shut since mid-March, began showing 【小题10】 of illness on March 27, according to the US Department of Agriculture National Veterinary Services Laboratories.