Ⅰ.语法填空
Hidden beneath the ocean waters and often 1 (call) the “rainforests of the sea”,coral reefs(珊瑚礁) are some of the most diverse ecosystems on Earth,with perhaps one quarter of all ocean species relying on reefs for 2 (survive).Being home to countless sea 3 (creature),coral reefs are important ecosystems for coastal people,too.It is estimated 4 coral reefs contribute billions of dollars to the world economy annually, 5 (provide) food,protection of shorelines,and jobs.
Unfortunately,coral species are being 6 (severe) threatened,many of which 7 (destroy) by pollution,overfishing practices,and other impacts over the past centuries.Climate change,which results in the increase in ocean temperatures and ocean acidification, 8 (be) the most pressing threat to coral reefs now.High water temperatures cause corals to lose the algae(海藻) that provide them with food, 9 makes the corals white and can increase outbreaks of infectious disease.
A team of researchers are trying to develop super corals at their research centre at the moment.They began by selecting certain coral species that seemed to have adapted to the changing ocean conditions better 10 others.Hopefully,the super corals will not only survive but thrive in the warmer and increasingly acidic ocean.
Ⅱ.短文改错
Welcome to the Great Wall.Measured more than 6,000 kilometers in length,the Great Wall is known as the long wall in the world.It has a long history of more than 2,000 years.That is amazing about the Great Wall is that it is main made of stones and bricks,and all the construction was done by hand.Though it was used to protect the country from foreign invaders,every few hundred meters along with the Great Wall,there was a watchtower.Now,as symbol of China,the Great Wall will become one of the most famous tourist attractions in the world.It is no wonderful that the Great Wall attract hundreds of thousands of foreign tourists every year.
