【推荐1】阅读下面短文，在空白处填入1个适当的单词或括号内单词的正确形式。

Climate change has caused a rise in sea levels. This has increased the amount of salt in fresh water     1     (use) on coastal farms. As     2     result, farmers are     3     (gradual) unable to use fields close to the sea.

However, Marc Van Rijsselberg, a farmer in the Netherlands is now using a     4     (mix) of sea and fresh water     5     (grow) healthy and tasty vegetables.

He teamed up with scientists from the Free University and divided a farm     6     eight irrigated areas. Separate pipes pumped fresh and sea water, and a computer program created water with eight levels of salinity(含盐度).

The water levels and the levels of salinity were controlled by computerized measuring     7     (device) called “sensors”. Mr. Van Rijsselberg said he was able to harvest vegetables from most of the eight testing areas. He said the vegetables     8     (be) smaller than those grown in fresh water. But he said they also had more sugar and salt, so they tasted much     9     (good).

He found that potatoes grew better than the other vegetables in the combination of sea and fresh water. Mr. Van Rijsselberg said four kinds of these potatoes would be sent to Pakistan     10     thousands of hectares of land were damaged by salinization last year.

【推荐2】阅读下面材料，在空白处填入1个适当的单词或括号内单词的正确形式。

Having a WiFi connection is no guarantee of a pleasant internet experience. If     1     signal is weak，you’11 spend a long time staring at a loading bar.

Now a group of engineers at the United States Massachusetts Institute of Technology(MIT)may have a     2     (solve). They     3     (design)a“smart surface”that can boost the WiFi signal in your home by nearly 10 times.

The smart surfaces are paper-thin，so they can be installed like wall-paper. They contain thousands of tiny antennas(天线)but don’t need power or wiring. All they do is reflect     4     (signal). A smart surface can work both as a mirror or a lens to focus radio signals onto the right devices. By doing so，it increases the median signal strength by nearly 10 times，    5     (double)the median channel capacity in an office environment.

According to the researchers，the smart surfaces would allow     6     (small) devices to be made，like tiny sensors that detect the indoor pollution levels or those that monitor machines in a warehouse. These were     7     (previous)believed to be too small     8     (give)off a strong enough WiFi signal.

In addition     9     easy usage，it will probably be relatively cheap. According to the estimations，such a setup could probably cost you a few cents per antenna.     10     bright side is that it would consume less power compared to conventional systems.

【推荐1】阅读下面短文，在空白处填入1个适当的单词或括号内单词的正确形式。

On Sunday, the Commercial Aircraft Corporation of China announced that the C919 aircraft     1     (complete) all six test flights. Many might not understand it,     2     test flights are no ordinary things in the life of a new aircraft model.

Test flights are more about     3     (judge) the aircraf’s safety and reliability. Now, with the C919 in place, domestic airlines can stop worrying about a supply crisis.

However, there is room for constant     4     (improve) , as some parts of the C919     5     (import) from the West. Even     6     Changjiang-1000A engine, a domestic alternative,     7       (have) many imported parts.

It is therefore necessary for the domestic manufacturers to work harder to     8       (constant) raise the proportion of domestic parts in the C919.

That will, in turn, help China’s aircraft-manufacturing industry to go global. So far, the CACC has reportedly received about 1, 000     9     (order) for the C919, with the majority of those coming from domestic airlines.     10     its improved performance and better technology, more international orders will come in the future.

【推荐2】阅读下面短文，在空白处填入1个适当的单词或括号内单词的正确形式。

China successfully launched its Chang'e 5 lunar mission (任务)，named     1     an ancient Chinese moon goddess,     2     (bring) moon rocks back to Earth. The unmanned Chang'e 5 collected as much as 4.4 pounds of lunar rocks from a     3     (previous) unvisited area on the moon. The mission makes China the third country, after the US and the Soviet Union, to have collected samples from the moon.

The Chinese moon program,     4     displays one of the strengths of China's approach to space exploration,     5     (begin) with the Chang'e-1 orbiter launches. China was late to the space race, but it     6     (catch) up fast in the past few years.     7     return of new samples has filled a major gap in our understanding of how the moon developed and helped China decide whether     8     (it) future missions on other planets are practical.

The famous Chang'e 5 lunar mission is part of the four-phase Chinese Lunar Exploration Program     9     (run) by the Chinese government, and is a     10     (prepare) towards sending Chinese taikonauts to the moon in future, perhaps around 2030.

【推荐3】阅读下面短文，在空白处填入 1 个适当的单词或括号内单词的正确形式。

Many of us wonder what lies in outer space. When we look up     1     the night sky, we see stars, the twinkle of a moving satellite and    2     (occasion) a distant planet. But one thing we don’t see is the millions of pieces of junk filling up space.

The amount of space junk     3     (increase). Over the last few decades, satellites and rockets    4     (launch) into space, littering the cosmos as they go. The fear is that     5     we don’t start taking this litter out of the sky soon, it will become a significant threat to active satellites. Nobu Okada, CEO of Astroscale,     6     company working on ways to clean up space junk, says “even a small paint fleck has enough power    7     (blow) up other satellites.”

It’s clear    8     a solution is needed so a celestial deep clean can take place.

    9    (look) to the future, like any litter problem, we need to look at ways of creating     10    (little).