Garden eels are very sensitive by nature.But the 300 garden eels that live in a tank at the aquarium had become used to humans.They rarely hid in the sand from visitors.To try to reintroduce the eels to humans,the aquarium is putting five computers in front of their tank.The public can connect through the Face Time app.

Once the video calls start,people are supposed to show their faces,wave their hands and talk to the eels.But considering the quiet nature of the animals,callers are asked not to shout.

The"face-showing festival"is set to take place Sunday through Tuesday,during Golden Week holiday.It has gotten plenty of support.One Twitter user wrote,"Interesting!When you gaze at the garden eels,they gaze at you.I'm happy to take part."

What does the underlined part in Paragraph 2 indicate?

A.Garden eels seldom disappear into the sand.

B.Garden eels are checked regularly by the keepers.

C.Humans sometimes present a threat to the aquarium's animals.

D.Humans almost escape from the memory of the aquarium's animals.