Tianjin is an important stop on one of the eight major bird-migration routes     1     North Asia to Australia, and many species rest in Beidagang’s coastal area before flying to Australia or New Zealand. The birds will return to Tianjin on their northward migrations that go as far     2     the North Pole. Beidagang Wetland     3    (cover) nearly 350 square kilometers, including an area of about 115 sq km, in the southeast of the Binhai New Area. The wetland is essential for the birds’ breeding and growth. “Without it, they may be in danger during their migrations,” experts say.

Beidagang Wetland Management Center deputy director Sun Baonian says they’ve made great efforts to improve rare — bird protection in recent years.     4     total of 1,347 Oriental storks have been identified in the wetlands,     5    (account) for nearly 45 percent of I he species’     6     (globe) migration population, he says. They prefer to nest in high trees and buildings. Since Beidagang doesn't have enough high trees, the center has set up 20 artificial nesting areas on poles, 13 of     7     have been used by the waterfowl (水禽). And 17 chicks were born in the wetlands late last year.

The center also offers “homes” for volunteers and tourists, who come to learn more about wetland protection and enhance their     8    (aware) about how to protect the wetlands and birds.

The project     9    (support) by the International Union for Conservation of Nature since 2012, following a high-level meeting in South Korea. In 2016, the IUCN encouraged China     10    (apply) for UNESCO status for the sites.

Earth is setting heat records. It will be much hotter one day. But     1    hot could it get? As a heat wave     2     (roast) the western United States last week, temperatures in California's Death Valley rose to 130 degrees Fahrenheit,     3     (mark) the hottest temperature measured anywhere on Earth since 1931 and the third hottest day ever recorded on our planet. It's difficult     4     (forecast) how hot Earth might get if we keep jamming carbon into the atmosphere,     5     (expert) say. As Michael   Wehner, an extreme weather researcher, put it in an email, "    6     increase in temperatures of future heat waves     7     (depend) a lot on how far into the future and how much more carbon dioxide we send out. ” But a recent research     8     (exact) tells people what the heat waves of tomorrow could look like if we don't control our carbon emissions (排放)at all. By the end of the century, heat waves in California could top out at temperatures about 10 to 14 degrees Fahrenheit     9     (high) than they do today, "I would expect that an event of the same rarity (罕见)     10    Today’s 130°F would be about 140°F in that high-emission future,” Wehner says.

Jingdezhen porcelain(瓷器)is Chinese porcelain produced in or near Jingdezhen in southern China. Jingdezhen has produced porcelain     1     (century)ago. And the town     2    was named Jingdezhen by Emperor Zhenzong of the Northern Song Dynasty became a major kiln(窑)site around 1004.During the period, the     3    (produce)of porcelain in this area first became     4    (know).By the 14th century it had become the largest centre of producing Chinese porcelain, which remained in the following times. In the Ming Dynasty, official kilns in Jingdezhen     5    (control)by the emperor, making quality porcelain in large quantities for the emperor to give abroad as gifts. As a result, the town was     6    (close)linked to the world.

Although being a remote town in a hilly area, Jingdezhen is near the quality porcelain stone and forests which can provide plenty of wood for the kilns. It also has     7    river flowing from north to south,     8    (benefit)the transport of the fragile objects.

Jingdezhen has produced a great variety of     9     (value) porcelain. As a result, the town is famous     10     the “Porcelain Capital”. One type of its well-known high quality porcelain object is the blue and white porcelain from the 1330s.

5 . Natural resources are things     1     exist in nature and can be used by people. Some natural resources are renewable, like trees. When one tree is cut down, we can plant a new tree to replace it. Others,     2    , are not renewable, like the coal dug out of the ground. Once it is used, it is     3    . (go)

Although we all know that our natural resources are limited, we often waste them in our daily life. Paper, bottles and cans     4     (throw) away carelessly; food is wasted just because of  its  poor  taste; clothes  are  rejected     5     (simple) due  to  their  old fashion. These valuable natural resources will run out before long     6     better use is made of them.

Actually, everyone can make contributions (贡献) to     7     (protect) our natural resources. For example,     8    riding a bicycle or walking instead of driving, we can save lots of petrol. Water is a very important natural resource because we all need     9     to stay alive. We can make wise    10     (choose) to save water, like reusing the water that has been used to wash vegetables to water flowers.