In order to observe the Tibetan antelopes, the author went to Xizang with his friends, from where they made 【小题1】a herd of graceful animals. He was greatly 【小题2】(strike) by their beauty. To prevent this species from 【小题3】(extinct), the Chinese government took effective measures to place it under national protection. As a result, its population has recovered and it was removed from the endangered species list.

The panda population in the wild 【小题1】(rise) in the last 20 years, which reflects the pandas’ improved living conditions and China’s efforts in keeping their habitats integrated. Now, it’s time 【小题2】(release) the cubs into the wild. 

A gene exchange between captive (被圈养的) and wild pandas aimed at 【小题3】(protect) genetic diversity is a major project at the China Conservation and Research Center for the Giant Panda, according to He Shengshan, a guardian and expert at the center. He said wild pandas live in 【小题4】 wide range of areas, so the population is divided into 33 groups 【小题5】(base) on their location. 

“This is similar 【小题6】 human villages or tribes. Some large groups in the wild may have 【小题7】(hundred) of pandas, while smaller groups may have just a few dozen. After investigation, we found that of the 33 communities, 22 communities had 【小题8】(few) than 30 giant pandas,” said He Shengshan. “Because pandas have a poor ability to travel and there are mountains, human activities, highways and railway tracks, giant panda groups can’t communicate with each other, and those with small populations are still at risk of 【小题9】(extinct) over time.” 

The training for release is a long process 【小题10】 starts before a cub is born. And usually it is divided into two stages. The first lasts from the mother’s pregnancy till the cub is about 1 year old, while the second stage runs from the cub to a panda about 1 to 2 years old.

Natural cloning has taken place for generations. A sheep called Dolly was the first mammal to be cloned 【小题1】 (successful). Since Dolly, more than 20 mammal species 【小题2】 (clone) including camels and goats. In 2018, China announced that two monkeys had been cloned. In 【小题3】 (compare) with other species, scientists have had to work hard to break the technical barrier to get primates (灵长类动物) with edited genes. Scientists say that major breakthrough offers the potential 【小题4】 (create) monkeys with identical genes to give more accurate research results.