In addition to the obvious dangers they face, military working dogs are at risk of temporary and permanent hearing loss. Whether in training, during transport such as helicopter flights,     1     in actual operations, the dogs can     2     (expose) to really loud noise.

In an attempt     3     (solve) this problem, the Canine Auditory Protection System (CAPS) has been developed,     4     uses lightweight, high-quality sound absorption materials to block unwanted sounds. Unlike     5     (convention) hearing protection, this solution is constructed of flexible materials that fit     6     (neat) over the unique shape of a dog’s head. This flexibility     7     (guarantee) proper scaling around the ear and maximum sound reduction.

The system uses a snood-style (发网式的) device to uniformly distribute the pressure needed to keep the hearing protection     8     place. At a little more than an inch thick, the device will not be a burden to dogs     9     (carry) out tasks in tight spaces. It is also compatible (兼容的) with other devices used by working dogs.

Even a short helicopter flight can affect a dog’s hearing, resulting in limited     10     (perform) and inability to hear the handler’s commands. This new technology protects the dog while on missions and can extend the dog’ s working life.

Featuring sparkling lakes, spectacular waterfalls, and colorful leaves, Jiuzhaigou National Park in Sichuan Province is a picturesque fairyland. The park’s name,     1     means “Nine Village Valley,” originated from the nine Tibetan     2    (village) there. It is located in Jiuzhaigou County of the Aba Tibetan and Qiang Autonomous Prefecture in Sichuan Province. It     3    (list) as a UNESCO world heritage site in 1992. The park is also home     4     3,634 species of plants and animals, including giant pandas and golden snub-nosed monkeys,     5    (win) the good reputation of an “earthly paradise”. The national park covers     6     area of 720 square kilometers and ranges from 1,996 to 4,764 meters above sea level.

In 2017, a massive 7.0-magnitude earthquake     7    (strike) Jiuzhaigou, and the scenic area was closed due to damage. After continuous reconstruction and natural     8    (recover), the park reopened to visitors in 2021. After the pandemic, the tourist destination has     9    (full) regained its former charm. Tourism facilities have also been improved     10    (provide) better services to tourists.

Chinese expedition (探险) team, on May 23, 2023, reached the summit (山顶) of Mount Qomolangma, the world’s highest peak,     1     they carried out scientific research.

The aim is to maintain and upgrade (升级) the eight weather     2     (station) at altitudes between 5,200 meters and 8,830 meters. The team members     3     (leave) the Assault Camp at an altitude of 8,300 meters at 3:00 a.m. And they arrived     4     the weather station at an altitude of 8,830 meters after climbing several hours.

Kang Shichang, a researcher at the Northwest Institute of Eco-Environment and Resources under the Chinese Academy of Sciences (CAS), has taken a team to     5     (physical) examine the glaciers (冰川).     6     (use) drones (无人机), 3D laser scanning and other advanced equipment, they monitored pollutants and changes in glaciers. Su Tao, a researcher at the Xishuangbanna Tropical Botanical Garden under CAS,     7     (lead) a team of four to carry out a field investigation in the Mt. Qomolangma region over the past two weeks. “Paleontological fossils (古生物化石) have     8     unique advantage because the shape and distribution of organisms are closely related to the environment,” said Su.

Over the past 60 years,     9     (count) Chinese climbers and researchers have come to Mt. Qomolangma     10     (measure) its height with their footsteps.

On the north bank of Fuxian Lake in Chengjiang County, Yunnan Province sits a straw-hat-shaped mountain     1     (call) Maotian Mountain,     2     a 512-hectare site is praised as a “world-class treasure trove of fossils” by the international scientific community. On July 1,1984, young paleontologists in China discovered a fossil of the arthropod (节肢动物化石) with a long tail in Maotian Mountain. “    3     we had studied in China were just shell of fossils. The arthropods, lifelike fossils with legs, which belonged to fossils of soft-bodied animals, are     4     game changer in the research of China’s paleontology (古生物学)”, Hou Xianguang, a paleontologist said.

Scientists have obtained a large number of research results on Chengjiang Fossil Site. The reason why Chengjiang fauna (动物群) is     5     great significance is that it is closely related to the emergence of the animal tree of life.

Up to now, more than 20 phyla and more than 280 species     6     (record)in the Chengjiang Fossil Site, of which, 80% are new species. On July 1, 2012, the Chengjiang Fossil Site     7     (be) inscribed on the World Heritage List by UNESCO,     8     (become) China’ s first World Heritage Site for paleontological fossils.

The UNESCO evaluation says the Chengjiang Fossil Site is one of the     9     (early) records of a complex marine ecosystem of the early Cambrian communities. The property displays excellent quality of fossil     10     (preserve). It presents an exceptional record of the rapid diversification of life on Earth during the early Cambrian period.

The year 1970 witnessed the establishment of the World Earth Day. Over 50 years later,     1     started as a grassroots movement has exploded into an international day of attention and campaigns     2     (commit) to preserving the environment. According to the Earth Day Network, one of the largest activist organizations holding Earth Day events, many a     3     (participate) across the globe celebrate Earth Day in a different way.

Rachel Carson’s book Silent Spring published in 1962 was among a series of critical environmental issues     4     (help) give birth to the environmental movement. The book brought     5     to light that the use of a pesticide called DDT was polluting rivers and destroying the eggs of birds like bald eagles. The number of the latter declined     6     (dramatic). Then, in 1969, a large oil leak near the Santa Barbara County coast     7     (drive) the then Senator Gaylord Nelson to put Earth Day on the national stage.

In the past years since the first Earth Day, there     8     (be) a large number of major environment wins. Protection has been put in place on everything     9     clean water to endangered species.

The theme of Earth Day 2023 is “Earth for All”, the concept of     10     emphasizes human beings must respect nature, follow its ways and protect it.