The conch (海螺)     1     (consider) as the national dish of the Bahamas. Queen conch is the most important food species and can live for 30 years.

Conch can be very costly in the US and other     2     (place). But it is so common in the Bahamas that it can often be found in meals     3     (cost) less than $10. That is less than the price of many meats on the island. Nearly two-fifths of the population in the countryside of the Bahamas eats conch     4     (week).

The country with a population of about 400,000 is home     5     9000 conch fishers around two percent of the population. This number appears to be holding steady (稳定的) even as conches decrease (减少) in number. The meat of the conch     6     (be) worth millions of dollars per year, and it also helps increase tourism to the islands.

Fishers usually catch the conch by hand. They often use simple equipment. Sometimes fishers can take home as many as 1,000 conches in a single trip. Many fishers fish for other species too, but they view     7     (they) as conch fishers first. And for many, fishing is both a family tradition     8     a path to middle class life on the islands,     9     the cost of living is higher than in the US.

Conch is one example of the threat overfishing presents to     10     (tradition) foods around the world.

Throughout history, many species of animals have been threatened with     1     (extinct) .When Europeans first arrived in North America, more than 60 million buffalo(水牛)lived on the continent. Yet hunting the buffalo was so popular during the 19th century that by 1900 the animal’s population     2     (fall) to about 400 before the government took action     3     (preserve) the species. In some countries today, the elephant faces a similar challenge, as illegal hunters kill the animals     4     the ivory(象牙)in their tusks.

    5    , not all animals with commercial value face this threat. The cow, for example, is a     6     (value) source of food, but no one worries that the cow will soon be extinct. Why does the commercial value of ivory threaten the elephant, while the commercial value of beef     7     (protect) the cow?

The reason is that elephants are a common resource, while cows are private goods. Elephants wander     8     (free) without any owners. The hunter has a strong motivation to kill as many elephants as he can find. Because hunters are numerous, each has only a slight motivation to care for the elephant population. By contrast, cattle live on farms     9     are privately owned. Each farmer makes great efforts to maintain the cattle population on his own farm because he harvests     10     benefit of these efforts.

Fifty years ago, China     1    (success) launched its first satellite, Dongfanghong 1, and started a new chapter in space exploration. To mark     2    (it) 50th anniversary, the China National Space Administration announced the name for the country’s Mars planetary exploration program on April 24. The mission, Tianwen got its name    3     a long poem Tianwen written by Qu Yuan,     4    famous poet of the Warring States Period. In the poem, Qu raised a series of     5    (question) concerning the sky, stars, natural phenomena, myths and the real world,     6    (reflect) his doubts on traditional ideas and his pursuit (追求) of truth. So far, China     7    (make) remarkable progress in space exploration. In 1970, China launched its first man-made Earth satellite, becoming the fifth country in the world to launch man-made satellites independently. Over the past few years, China’s missions, including the Shenzhou and Change series were designed     8    (explore) outer space, expanded mankind’s understanding of Earth and the universe. This time, the Tianwen series will carry out the first Mars exploration mission,     9    represents a milestone for China’s move toward deep space. With the names deep roots in Chinese traditional culture, Tianwen demonstrates the     10    (determine) and perseverance of Chinese people to move further into deep space.

Since the beginning of the 21^st century, artificial intelligence (AI)     1     (find) its way in different areas in the entertainment industry. Disney, which is one of the worlds leading entertainment     2     (company), has decided to make use     3     the technology in its theme parks, where robot cartoon characters will soon walk among guests. Disney has also its robot Mickey Mouse and Donald Duck to communicate with tourists.

“I think AI is going to be     4     (great) important for what we do,” said Jon Snoddy, an official of the entertainment company. “Robot characters that can move around among our guests need to understand where they're going and know     5     to behave in a world with humans.”

However, the company also     6     (know)some of the fears surrounding AI.     7     (scare) kids won’t be part of what we do, said Mr Snoddy. “We will go and do tests in our parks to find out what kids find     8     (interest) about these things. We will carry out tests     9     (make) sure the robot characters make a positive     10     (impress) on kids.”