【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。

    1     internet technology expanding every day, it is hard to keep up with the innovative software that keeps popping up on a regular basis.     2     Bitcoin was first introduced in 2009, it is still a relatively new player in the online payment system. What makes this internet payment network so special is its     3     (unique). It makes it possible to transfer Bitcoin currency from one peer to another quickly and effectively. The processing fees are very low and you can make worldwide payments in minutes.

Bitcoin is a digital currency that is bought, sold and transferred between fellow     4     (use) of the same payment network. The process begins when the prospective member downloads the software to their computer or phone. Once you     5     (complete) this process you will receive a Bitcoin address. The address is used to send you payments for goods or services rendered. This currency can also     6     (buy) on a market exchange. You can sell your bitcoins at this exchange as well. The unique thing about this payment network is that the currency is decentralized. It is not owned or controlled by any bank or     7     (finance) institution. It is not insured by the FDIC. It is open to anyone that wants to become a member. More and more merchants     8     (accept) this digital currency for their goods or services. There is no risk and the encryption process is very effective.

The following shows how the bitcoin works. You install a wallet on your computer or phone. You receive your new IP address. Then you begin accumulating bitcoins through purchase or transactions. All transactions on the payment network are stored in a Block Chain, which is nothing more than a     9     (share) public ledger. Bitcoins are transferred instantly and is verified mathematically by the network. Currency is transferred from one wallet to another quickly, safely, and securely. The Bitcoin mining process is     10     the transactions are constantly stored in the block chain and then verified by the computer.

【推荐2】阅读下面短文，在空白处填入一个适当的单词或括号内单词的正确形式。

Around 1,500 rice seeds, weighing 40 grams,    1    (travel)with China's Chang'e---5 spacecraft in November, 2020. After its 23---day space journey the seeds successfully returned to the earth and    2    (plant)at the plant space breeding(繁殖)engineering technology research center of the South China Agricultural University. Growing well on earth, the green seedlings will be planted in the field at    3    end of March, 2021, providing a "chip for China's seed security."

The deep space environment is    4    (extreme)unique and is expected to produce even stronger genetic effects. The seeds have experienced special environments including microgravity and sunspot    5    (erupt)in the process of space travel,    6    affects the genetic variation of rice seeds. These seeds contain 40,000 genes and can be tracked in a targeted way    7    (find)what good genes that can be used, according to the researchers. This batch of seeds is    8    scientific research value, as it will help to select    9    (value)new genes to serve rice variety breeding, according to experts.

Chinese scientists will be able to explore the origin of life, species evolution and aerospace bio---safety by deeply    10    (research)the molecular and genetic mechanisms of model organisms responding to deep space environment through rice seeds.

【推荐3】Directions: After reading the passage below, fill in the blanks to make the passage coherent and grammatically correct. For the blanks with a given word, fill in each blank with the proper form of the given word; for the other blanks, use one word that best fits each blank.

Laziness and Lack of Sleep Can Shorten Your Life, Especially When Combined

You already know that smoking is bad for you and that drinking too much alcohol may shorten your life. Now a new study says that spending too much time in a chair and not having enough sleep should join a short list of behaviors     1     (know) to increase your risk of premature death.

Sitting for a long time and lack of sleep were damaging in their own way, but when combined with more traditional risk factors,     2     had a multiplier effect that made an early death far more likely.

The findings, published in the journal PLOS Medicine, make clear that “some risk behaviors tend to come together and     3     the joint risk could be much higher than the sum of the individual risks”.

For instance, smoking was     4     (dangerous) single risk factor among the six studied. The small number of people for     5     smoking was their only bad habit were 90 percent more likely to die during the course of the study than people who were with practical clean living in every aspect. People who reported high alcohol consumption as their only risk factor did not seem     6     (put) their lives in danger. But for those who combined heavy drinking with smoking, the risk of premature death was doubled. And when lack of sleep     7     (add) to the mix, the likelihood of an early death was nearly five times greater     8     lack of sleep by itself had only a light effect on death.

These numbers are based on the lives of 231,048 Australians.

    9     (consider) factors such as age, gender, education and other factors, the researchers saw a clear pattern. It was a person’s bad lifestyle     10     contributed to his or her risk of premature death.