1 . The Silk Road is arguably the most famous long-distance trade route of the ancient world. This passage connected Europe in the West with China in the East, and allowed the exchange of goods, technology, and ideas between the two civilizations. Although merchants could make huge profits travelling the road, it was not without risk.
The main Silk Road started in Chang’an (known today as Xi’an), the early Han capital. Travelers commencing their journey from this city could take a northern route that would take them across China’s northwestern provinces. After this, they would face the Gobi Desert, arguably the greatest danger of the Silk Road.
The Gobi Desert, the largest desert in Asia, consists mainly of rocky, hard earth. This feature made it easier for traders to travel across, compared to sandy deserts like the neighboring Taklamakan Desert. Like other deserts, the Gobi Desert is dry and hot, and therefore the biggest challenge travelers faced was obtaining enough water for themselves as well as for their camels.
So, rest stops were created along the route, allowing travelers to rest, eat and drink. These places also promoted the exchange of goods, and even ideas, amongst the travelers who stopped there. Usually, the rest stops were placed within a day’s journey of each other. In this way, travelers could avoid spending too much time in the desert, which would make them targets for robbers, another danger of the Silk Road.
Once through the Gobi Desert, travelers would continue their journey into Iran, Turkey, and finally Europe. While this part of the journey may have been less dangerous, it is not entirely without its perils (风险).
1. The underlined word “it” in the first paragraph refers to _________.| A．making huge profits | B．traveling the Silk Road |
| C．exchanging goods and ideas | D．connecting different civilizations |
| A．The desert’s surface was easier to walk on. |
| B．Camels for transportation were easier to find. |
| C．It was smaller and could be crossed in less time. |
| D．There were more natural water sources available. |
| A．Travelers were offered free accommodation. |
| B．They were located around the edges of the desert. |
| C．They were shared by travelers from different countries. |
| D．Exchanging goods and ideas there was entirely without risk. |
| A．The origins of the Silk Road. |
| B．The benefits of the Silk Road. |
| C．The difficulties faced by Silk Road travelers. |
| D．The cultural exchanges among Silk Road travelers. |
2 . In April 2018, a group of Canadian scientists flying in a helicopter (直升飞机) discovered something they didn't expect to see — a huge, unknown cave with an opening the size of a football field.
The cave was discovered in the northern part of Wells Gray Provincial Park, in a wild, faraway area of Canada's Cariboo Mountains. The area is hard to get to and even harder to travel through. It is covered with snow for much of the year.
The group told Catherine Hickson, a scientist who studies rocks, about the cave. Dr. Hickson got a team of researchers together to study it. In September, they went for a closer look after most of the snow melted (融化). The cave is one of the largest in Canada. Not only is the opening to the cave larger than a football field, the cave is also deep. The team couldn't measure (测量) all the way to the bottom, but they think it may be more than 180 meters deep. The cave is tens of thousands of years old. But the rock in the cave is made of used to be at the bottom of an ocean (海洋). It is hundreds of millions of years old.
A small, but fast river of melting snow leads into the cave on one side, creating a waterfall near the top and a river at the bottom. The water comes out again a long way away. The exit (出口) is about 2.1 kilometers away and about l/2 kilometer lower down.
The cave will have to wait to get an official name. For now, the cave is being called "Sarlacc's Pit "because it looks similar to the home of the Sarlacc, a person in the Star Wars movie Return of the Jedi.
For Dr. Hickson, there's a lesson to be learned from the cave. "It shows you that you don't know everything, "she says." There are things yet to be discovered."
1. Why did the cave remain unknown in the past?| A．It is in a wild mountain area. | B．It has been there for just a few years. |
| C．Its opening is too small to be noticed. | D．The weather there is cold all year round. |
| A．The history of the cave. | B．Some facts about the cave. |
| C．The value of studying the cave. | D．The methods of studying the cave. |
| A．The snow. | B．The river. | C．The ocean. | D．The rock. |
| A．local culture | B．its discoverers | C．the way it looks | D．the name of a film star |
3 . When you think of the icy Arctic Ocean, do you picture cold blue waters, on which float (漂浮) icebergs home to animals and fish not seen elsewhere on the planet? Think again, or rather add 300 billion pieces of plastic (塑料) to your picture. That's the amount of plastic that scientists believe is floating around the Arctic Ocean. Most of the plastic is in the area to the east of Greenland and north of Scandinavia.
Where did it come from? After all, the lands near the Arctic are not really full of people. It turns out that ocean currents are carrying plastic thrown into the ocean all the way to the Arctic. An ocean current is an unending movement of sea water from one point to another. It is caused by several things including heat from the Sun, wind and movement of the Earth.
Many of these plastic pieces seem to have travelled for years before reaching the Arctic. This was worked out by scientists studying the plastic problem after they observed the condition of the pieces. While much plastic floats on top of the water, a lot also may be on the sea floor.
Plastic has been widely used for 60 years on Earth and our careless throwing of plastic things is slowly turning the once perfectly clean Arctic into a dangerous place. Unlike food waste and plant waste, plastic doesn't break down so easily. In fact the United States Environment Protection Organization reports that “every bit of plastic ever made still exists”.
What's the effect? Seabirds, sea turtles and other ocean creatures could get hurt and die when they accidentally swallow plastic. Plastic waste affects fishing, affecting people who earn money through fishing. Plastics can let out dangerous poisons (毒物) into the water. These may be swallowed by fish, and when these fish are caught and eaten by people or bigger animals, they could get poisoned too!
1. What can we learn from the passage?| A．The Arctic Ocean is heavily polluted. |
| B．The plastic is mostly in the area in the east of Greenland. |
| C．An ocean current is just caused by the movement of the earth. |
| D．Much more plastic floats on top of the water. |
| A．Humans throw away plastic things at will. |
| B．Ocean currents carry plastic things everywhere. |
| C．Plastic can let out harmful things into the water. |
| D．Plastic is hard to break down. |
| A．Break down. | B．Take in. |
| C．Accept. | D．Touch. |
| A．Are Men to Blame for Plastic Ocean? | B．Arctic Ocean and Its Future! |
| C．Is Plastic Harmful? | D．Arctic Ocean or Plastic Ocean? |
4 . The District of Columbia is a destination filled with sites of historic and current importance. During a visit, you can learn about the structure of our government and see monuments, museums and much more.
After exploring some of Washington DC's amazing monuments, the next stop should be to plan out a visit to some of the Smithsonian Institution's complex of museums. With over 19 museums and the National Zoological Park, it’s unlikely that you will have the time to explore each of these museums on a single visit. The best way to enjoy the Smithsonian Institution is to plan out which museums you are most interested in visiting. If you are interested in culture, the National Museum of African American History and Culture is a wonderful choice, where you can learn about the richness and diversity of the African American experience.
Washington DC doesn't just have monuments and museums. There are also chances to enjoy the great outdoors.
The arts and entertainment in Washington DC are also an important part of any trip to the city.
| A．Washington DC is filled with important monuments. |
| B．You will find art galleries, clubs and fantastic restaurants. |
| C．The city has many parks and places to walk and enjoy. |
| D．These important landmarks are open all day and into the evening. |
| E．The District of Columbia is one of the great destinations you can visit. |
| F．You can see the Washington Monument, the Lincoln Memorial and many more. G. Another museum that you should visit is the National Museum of the American Indian. |
