It's 2023 now. Three cute brown bear cubs who got lost after getting separated from their mother became popular on the Internet.

The cute cubs were spotted by Gelek Gyatso, an ecological protection officer, when he was patrolling (巡逻) a riverbed at an altitude (海拔) of nearly 4,500 meters in Qumarleb county in Qinghai province’s Yushu.

The little cubs quickly ran toward Gelek Gyatso on the snow-covered riverbed, then stopped short at a safe distance to look at him. After realizing that the man was not their mother, the bear cubs turned around and ran along the river calling for mom.

This was Gelek Gyatso’s first meeting with bear cubs separated from their mother. With his knowledge of wild animals, he drove the cubs towards an area near their cave in the hopes of a safe reunion (重逢).

Thankfully, later that day, other patrol officers found that the mother bear had reunited with her cubs and that the family was happy and healthy.

This year marks Gelek Gyatso’s tenth year as an ecological protection officer. He patrols the area every day, records the animals he sees, checks on the vegetation, and helps clean up litter.

Over the ten years, Gelek Gyatso has seen great changes in the ecological environment of his hometown. There has been an increase in the number of wild animals, and everyone is taking part in the protection of these species (物种), making the world a more beautiful place.

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1. What does the underlined word “spotted” mean?（词义猜测）

A    Polished.

B    Failed.

C    Punished.

D    Discovered.