【推荐1】Today, our class went to “The Fishery”,     1     is a local fish store, because we are learning about fish: where they live and how they are different from people. Inside the store it was very dark, except for the bright lights on top of each tank. The girl     2    (work) in the store told me that the lights are neon, and they are used to show off the bright colours of each fish. Under the lights, the fish were blue, purple, yellow, and green. They     3    (look) so beautiful that I wanted to take all of them home.

China is aiming to have 6.66 million hectares of farmland on which to grow potatoes by 2020, as the crop is set to become the nation’s     1     (four) food staple (主食) after rice, wheat and corn, according to the Ministry of Agriculture.

Potatoes     2     (plant) in China for about 400 years and now cover 5 million hectares. China is the world’s     3     (large) producer of potatoes. However, the annual consumption of potatoes per person is only 41.2 kilograms, far below     4     of the European Union and the United States.     5     (compare) with other food staples, the potato is easier to improve its output. It is time for potatoes to become a staple food,     6     can make the dinner table diverse.

“Grain production in China is increasing year after year, our food supply is adequate, and the national food     7     (secure) is guaranteed,” said Pan Wenbo from the Ministry of Agriculture. The country has set a “red line” minimum of 120 million hectares of arable (可耕种的) land, but pressure on the land is still great,     8     (large) due to rapid urbanization. The potato planting area will expand to 10 million hectares     9     (guarantee) the country’s grain supply. According to the ministry, the key     10     expanding the area is the development of the vacant farmland in winter in South China.

【推荐2】Just How Buggy is Your Phone?

What item in your home crawls with the most germs? If you say     1     toilet seat, you’re wrong. Kitchen sponges top the list. But cell phones are pretty dirty too. They contain around 10 times as many germs as toilet seats. People touch their phones, laptops, and other digital devices all day long, yet rarely clean them.

In one incident, a thief paid a terrible price for stealing a germy cell phone. He stole it from a hospital in Uganda during a widespread of the deadly disease Ebola. The phone’s owner reported the theft before     2    (die)from the disease. Soon, the thief began showing symptoms and finally     3    (confess)to the crime.

    4     in that unusual case a cell phone carried dangerous bacteria, not all germs are bad. Most cause no harm. In fact, they could provide helpful information. Look at the surface of your phone carefully. Do you see some dirty mars? “That's all you,” says microbial ecologist Jarrad Hampton-Marcell. “That’s biological information.”

It turns out that the types of germs that you apply all over your phone or tablet are different from     5     of your friends and family. They’re like a fingerprint that could identify you. Some day in the future, investigators may use these microbial fingerprints to solve crimes. Phones and digital devices may be one of the best places to look for buggy clues.

In a 2017 study, researchers sampled a range of surfaces in 22 participants’ homes,     6     countertops and floors to computer keyboards and mice. Then they tried to match the microbial fingerprints on each object to its owner. The office equipment was easiest to match to its owner. In an     7    (early)study, a different group of researchers found that they could use microbial fingerprints to identify the person who     8    (use)a computer keyboard even after the keyboard sat untouched for two weeks at room temperature.

One day, microbial signatures might show     9     people have gone and what they have touched. They could prove     10     an unmarked device is yours. So, sure, your phone is pretty germy. Does that inspire you, or does it just bother you?