题目内容：

阅读下面材料，在空白处填入1个适当的内容或括号内单词的正确形式。

With fewer than 2, 000 giant pandas left in the wild, the sighting of one of the lovely animals is a cause for 1. (celebrate). However, the one recently spotted walking through a bamboo forest in China’s Sichuan Province is even more so, 2. (consider) that it is the worlds first known all-white panda!

It 3. (spot) by an infrared (红外线的) camera set up to monitor the wildlife in the Wolong National Nature Reserve on May 25, 2019, 4. is also home to China’s first giant panda breeding and research center. Wolong officials estimate the panda, whose sex is hard 5. (determine) from the photo, is between one and two years old.

6. is generally believed that the giant pandas unique black and white coloring allows it to blend in with the snow during winter or to hide in the shade during summer. Some 7. (scientist) also believe the dark circles around the eyes help the panda bears recognize each other. 8. (lucky), the lack of markings does not seem to have affected the all-white panda so far.

The researchers say albino (白化病) animals are rare in general. That’s because it can only happen if both parents carry the gene. With so few specimens of panda bears left in the world, the possibility of that happening is almost next 9. impossible. Researchers believe if its offspring can be photographed, it will be 10. (value) for further research.