Li Chunru,    1    72-year-old retired doctor in a village in East China's Jiangxi Province, has been voluntarily taking care of wild birds at Poyang Lake Nature Reserve for over 30 years, bringing over 50, 000    2    (wound) birds out of danger.

For the past 36 years, Li Chunru woke up at 5 o'clock in the morning every day and walked along Poyang Lake regularly, protecting birds from any    3    (harm)human activity. Li is among a group of volunteers    4    came forward to protect the wild birds from illegal(不合法的)activities that are endangering the existence of some species in the area. His selfless    5    (devote) to the bird protection started one day 30 years ago, when a storm destroyed the birds' nest near his house,    6    (leave) the birds scattered around. Li was    7    (deep) struck by the scene and saved 310 out of the 370.

At first, Li's work was not understood by the    8    (villager) including his family. But Li never gave up. Instead, he kept convincing them with the knowledge of the law for environmental protection. His efforts finally paid off-more and more people started to accept Li's faith and voluntarily joined the team    9    birds' protection. And the aim of stopping illegal activities around Poyang Lake    10    (achieve) in 2017.

Workers in India are moving over 300 crocodiles from their home because they are too near a new tourist sight. They could be a danger to tourists     1     (visit) the new Statue of Unity which was opened to the public recently. It is 182 meters high and is the     2     (tall) statue in the world. It is next to a reservoir, which is also home to many crocodiles. Tourism officials want to have the crocodiles     3     (move) so seaplanes for tourists can land on    4    reservoir. If the crocodiles stayed, they could be dangerous and attack tourists. Officials are using     5     (cage)to catch the animals. They are going to a new home in another part of Gujarat.

Animal lovers are angry about the moving. One said, “The government is disturbing their home and putting their lives     6    risk. The government hasn't thought out where it will set free the seized crocodiles safely.” So far, only 17 of the animals     7     (catch)and moved. Another said, “Have we collectively lost our minds?     8     any environmentalist will tell you, this is     9    (complete) crazy.” Moving the crocodiles could break India's wildlife protection laws. An official said the crocodiles had to go for “    10     (secure) reasons”.

A population of the world's most invasive mosquito species was almost completely wiped out by    1    experiment on two islands in the southem Chinese province of Guangdong, according to a study , which     2    (publish) Wednesday

The experiment successfully reduced the female Asian Tiger Mosquito population-the main source of bites and disease transmission-by up to 94%,    3     (reduce) the number of reported human bites by 97%.

One of the Chinese study's    4    (researcher), Xi Zhiyong, a professor at Michigan State University, has been a longtime pioneer in this field of study,    5    is running a mosquito factory in southern China. He    6    (previous) attempted to use sterilized(绝育的) male mosquitoes to mate with unaltered females In the new study,    7     (publish) by the International Journal of Science, Xi and his colleagues attempted to cut mosquito numbers even    8    (far) by limiting both males and females' ability to reproduce.

The results were so successful that they nearly    9     (wipe) out the entire female mosquito population on the two islands.

Mosquitoes pose grave threats to human health beyond just irritating bites. However, there is currently no effective vaccine or treatment     10    most mosquito-transmitted diseases, leaving controlling the insects' populations one of the most effective control methods, according to the International Journal of Science.

Sudan is the only male northern white rhino (犀牛) left in the world. That     1     (mean) Sudan, 42, is the last hope for avoiding extinction.     2     (protect) him, officials have placed him under 24-hour armed guard at the OI Pejeta Conservancy in central Kenya. Sudan lives there     3     two female northern white rhinos, Fatu and Najin.

Northern white rhinos,     4     can weigh up to 5,000 pounds, were once plentiful across northern and central Africa.     5     (hunter) have killed thousands of rhinos because of     6     high demand for the animals，horns (角). Rhino horns, believed to have medical effects, are used in     7     (tradition) Asian medicines. More than 1,000 rhinos     8     (kill) in 2014 in South Africa alone and fifty-four rhinos in Kenya, which has a much     9     (small) population.

Sudan, Fatu, and Najin have had their horns     10     (remove) so that they will not be hunted. People hope Sudan and one of the females will be able to have a baby. Sudan is very old, but scientists will not give up hope.