China witnessed its third aircraft carrier on June 17 in Shanghai, naming it    1    the eastern coastal province of Fujian.

Upon its    2     (complete), the giant ship will displace (排水) more than 80,000 metric tons of water,    3    (make) it the largest and mightiest warship any Asian nation has ever built. It will use    4    new system to launch fixed-wing aircraft, which will give it a much greater combat (作战) capability    5     the two predecessors (前任), the Liaoning and the Shandong.

The carrier, in the next phase, will undergo a series of trials to    6    (comprehensive) test its overall capabilities and specific equipment. Its home port will be decided    7     (base) on a host of factors, including the nation’s    8    (secure) needs, the ship’s tasks and candidate ports’ support capacity.

The PLA Navy currently operates two carriers CNS Liaoning and CNS Shandong, both of    9     have a displacement of around 50, 000 tons and use a ski jump mode for launching fixed wing aircraft. Compared with the two predecessors, the Fujian is much bigger and heavier. In addition to the J-15 fighter jet, the new carrier    10     (expect) to have new advanced combat planes or drones.

By recycling paper we save our trees, but we also recycle glass bottles, paper and plastic.     1     is known to all that recycling protects many non-renewable resources and reduces greenhouse gases. Now cleaners send     2     (little) household waste to landfill sites and less energy     3     (require) when making new materials from old ones.

Health regulations once prevented recycled plastic     4     being used for food containers but new technology has seen this ban lifted in some countries.

Rain water     5     (collect) from roads and the roofs of buildings is also recycled. Water treatment plants treat millions of liters a day ,     6     (remove) something unwanted. The recycled water can’t be drunk or used for cooking     7     can be used to wash cars , water parks and fight fires, etc. This means there is     8    reduced demand on drinking water supplies.

New technology is     9     (rapid) improving recycling techniques in Europe, America and Japan, but countries with small populations may find these new     10     (develop) too expensive to use in the immediate future.

Over the past half century, using chemical fertilizers       1     (become) very common in farming. Many farmers welcomed       2     (they) as a great way       3     (stop) crop disease and increase production.       4     (recent), however, scientists have been finding that long-term use of these fertilizers can cause damage       5       the land and, even more dangerous, to people’s health. With these       6     (discovery), some farmers are beginning to turn to organic farming,       7       is simply farming without using any chemicals. There       8     (be) many different organic farming methods. All of them have       9       same goal: to grow good food and without       10     (damage) the environment or people’s health.

A 150, 695-square-foot organic rooftop(屋顶)garden will open in the heart of Paris.

More than 30 different plant species will be grown on the roof and gardeners will be able to harvest lots of fruits every day. The fresh produce will be used     1     (feed)local communities and supply a restaurant in the building. The project will use advanced watering technology and doesn’t require soil, making the farming process     2     (incredible)resource-efficient.

This farming project will provide a window into a rapidly     3     (grow)form of agriculture that could significantly improve global food security, fight against climate change, and reduce air     4     (pollute).

“The goal is to make the farm a globally recognized model for     5     (sustain)production,” said Pascal Hardy, founder. of Agripolis. the urban farming company behind the project.

    6     is obvious that urban farming has become increasingly popular in recent years. Countries such as Singapore are betting big     7     the success of urban farming to improve food security.

In 2016, the Parisian government     8     (launch)a program called Parisculteurs,     9     aim is to create 100 hectares(公顷)of green space in the capital by 2020. Once Agripolis’ farms start producing     10     (vegetable)and fruits, the city will be well on its way to achieving this goal.

In a hungry world, rice     1     (be) a staple food and China is the world’s largest producer. Yuan Longping, the scientist born and     2     (bring) up in China, is a leading figure in the rice-growing world. He thought that the key     3     feeding people was     4     ( have) more rice and to produce it more quickly. He thought he could make it only by crossing different species of rice plant and producing a new one which could give a     5     (high) yield than either of the original plants. Yuan Longping did lots of experiments, the results of     6     were published in 1966. Finally, in 1970 a     7     (nature) sterile male rice plant was discovered. As a result of those     8     (discover), Chinese rice production rose by 47.5 percent in the 1990s. In Pakistan rice is the second most important crop and     9     (grow) in many parts of the country in the future. Its yield is much greater than     10     of other types of rice.