1 . Directions: Read the following passages. Fill in each blank with a proper sentence given in the box. Each sentence can be used only once. Note that there are two more sentences than you need.

Everyone , including members of Congress and Native American tribes (美国印第安土著部落), wants fewer wild horses on Western lands and tribal reservations.(土著保留地).    1    

The wild horses come from horses that were brought to America from Spain in the 16th century. By 1971, the number of wild horses had dropped sharply. So Congress passed a law to save them. Since then, the number of wild horses has increased three times in size.

Experts predict there will be 115,000 wild horses by 2020.An average adult wild horse eats more than two-and-a-half kilograms of grass and drinks 75 liters of water a day.    2    

The horses’ actions have also caused soil erosion (土壤侵蚀)around water sources, threatening water quality. Gillian Lyons is a wildlife expert at The Humane Society of the United States.

She said, “Originally, when the 1971 act passed, it allowed the Bureau of Land Management(国土管理局) to destroy healthy horses…if populations grew too large. “Since 1994, except for one year, the BLM has been prevented from destroying wild horses. The agency now captures and places them in holding facilities(收容所). A few horses are adopted, but not many. It costs about $50 million a year to care for the captured animals.     3    .If Congress approves the plan, the BLM would have to find other ways to manage horse populations. “They’re going to do that in a couple of ways,” said Lyons. “One is by reducing any use of fertility control(节育措施), which they use barely any of now. And the other way is by getting rid of horses in holding facilities.” Recently, a House committee(众议院监管委员会) voted to permit the BLM to kill the horses. But a Senate committee voted against another bill that would lift the ban(禁令) on horse killing. Native American tribes have struggled with the problem for years. Some support capturing the animals. But others, including leaders of the tribes, say the animals should be treated well and not killed.

The Northwest Tribal Horse Coalition(西北部落马联盟) is made up of five small groups and tribes in Idaho, Oregon and Washington. It says in the short term controlling the number of wild horse births will not stop overgrazing(草场的过度放牧). It supports the slaughter of horses at “humane(人造的) facilities.” An estimated 48,000 wild horses live on the Navajo Nation’s 7,000 square kilometers in Arizona, Utah and New Mexico. Duane “Chili” Yazzie is the president of the Nation in Shiprock. Yazzie has started a horse capture program he considers more humane.     4    He is also looking to train them as farm animals.

A．The wild horse is a vital component to ecological balance on the range lands.

B．President Donald Trump wants to cut the BLM budget by $ 10 million in 2018.

C．Only in this manner will wild horse numbers be in balance with all other forms of wildlife and predators of the wild horses.

D．But there is little agreement on how the number should be reduced.

E．The program would euthanize sick and old wild horses and sterilize healthy ones before returning them to the wild.

F．As a result, non-native plants begin growing in the affected areas.

2 . 根据短文内容,从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。
There are thousands of coral reefs (珊瑚礁) in the world; Unfortunately, however, they are now in serious danger. More than one-third are in such bad shape that they could die within ten years.    1    Here are the three main causes discovered.
The first cause is pollution on land. The pollutants run with rainwater into rivers and streams, which carry the poisons into the ocean.    2    So they will be easily infected (感染) with diseases.
    3    Higher ocean temperatures kill the important food source (来源) for the coral—the algae, the tiny greenish-gold water plants that live on coral.    4    This process has happened more and more frequently in recent years.
The last factor contributing to the disappearance of coral reefs is people. People sometimes crash into reefs with their boats, breaking off large blocks of coral.    5    Moreover, some people even break coral off to collect for souvenirs since it is so colorful and pretty.

A．Global warming is another reason.

B．Many might not even last that long!

C．Divers who walk on reefs can also do serious damage.

D．Reefs provide a home for 25% of the fish in the ocean.

E．Chemicals from the poisons kill reefs or make them weak.

F．Steps must be taken now to stop over-fishing and pollution of the oceans.

G．When the algae die, the coral loses its color and it also dies in the end.