2 . The first Thursday in May is World Password Day, but don’t buy a cake or send cards. Computer chip maker Intel created the event as an annual reminder.     1    .

The purpose of a password is to limit access to information. Having a very common or simple one like “abcdef” or even normal words like “password”, is barely any security at all.     2    . Hackers’ password cracking tools take advantage of this lack of creativity and get in our accounts easily. More experienced users would choose a less common password. However, they might still fall victim to cracking software.

    3    ? A secure password is all that stands between us and a cybercriminal. It should be unique and complex, which a hacker can’t easily guess or crack. The best passwords are supposed to be at least 15 characters long and full of random numbers and letters. However, a long password means a complicated process to log into a website.     4    . You may want to write it down, but it is not suggested due to risk.

Then what should we do?     5    . You can choose a phrase such as “I want to go to England.” Next, convert it to an abbreviation (缩略语) by using the first letters of each word and changing the word “to” to “2”. Then you get following password phrase: iw2g2e. You can make it even more complex by adding punctuation, spaces or symbols: %iw_2g2e!@. It is much easier to remember and safer.

Can’t wait to try? Let’s say goodbye to “666666” and change your password right now.

A．What do network security experts do

B．Try using shortened phrases for passwords

C．How can we ensure the safety of a password

D．Changing password regularly is an effective way

E．That is like closing a door but not actually locking it

F．It is used to say farewell to popular passwords like “123456”

G．And it is also difficult for us to remember a long irregular password

3 . 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。

Who invented the ATM? There have been     1     (argue) for years over who should officially go down in history as “the inventor of the ATM”. Now the UK government is     2     (clear) saying it was James Goodfellow     3     invented the ATM.

Back in the mid-1960s, James Goodfellow was working     4     a development engineer for Glasgow firm Kelvin Hughes, and had been charged with inventing a way to enable customers to withdraw (取) cash from banks when Saturday opening ended. “Most people     5     (work) during the week couldn’t get to the bank. They wanted a solution. The solution     6     (be) a machine which would issue cash on demand to a     7     (recognize) customer, ” he said. “I set out to develop a cash-issuing machine, and     8     (make) this a reality, I invented the pin (personal identification number) and an associated coded token (代币).”

The cash machine has become a world-conquering piece of technology. There are now 3 million ATMs worldwide, with     9     number forecast to hit 4 million by 2020. The good news for Goodfellow is that people are beginning to know him for his invention. Even     10     (good) for him, the Home Office has now officially recognized his other achievement.

4 . We were high in the mountains of Xishuangbanna, as far south as you can get in Yunnan, skirting the borders of Myanmar and Laos. The drive was typical, textbook beauty: mountains thick with rubber tree forests, pu’er tea plantations and banana palms and tiny Dai villages. Hidden among the fields of green, I spotted an odd collection of wooden boxes near a tent on the side of the road.     1    

We had run into the current home of Wei Dajing, a 17-year-old apprentice (学徒) beekeeper who was manning his hives. Wei was fresh to the beekeeping life, and had been on the job for just two months and was here to learn from a master beekeeper. Their tent and hive set-up is always temporary.    2     This particular spot was stationed at a sunny patch of yellow flowers. Once these flowers die, the rubber trees will be flowering, so we will move toward them,” he told Sam.

Like thieves in the night, the beekeepers will stealthily pack up their hives in the dark once the bees go to sleep. “They are most active around midday when they are collecting their nectar (花蜜).    3     ” Wei explained.

The hives were humming, and bees were invasively buzzing around Wei as he spoke to us. Pieces of fruit lay drying among the hives, used to feed the bees and give them an extra boost of energy once Wei bottles up their hard-earned honey. Sam, who also has a couple of his own small hives in his backyard, tells us you must always leave a little bit of honey in the hive.    4    

We waved goodbye to Wei. Back at Sam’s house, he gave us a bowlful of local honey.    5     Lacking the usual sweetness of honey but instead rich with a more savory, spiced flavor, it tasted just like China.

A．It was smooth, thin and runny.

B．Wei skillfully collected honey from the hives.

C．Otherwise the bees get fed up and abandon you.

D．Maybe it is the flowers that give such unique taste to the honey.

E．By 10 pm they are asleep in their hives, which is when we move.

F．I asked our excellent guide and new best friend, Sam, to pull over.

G．Wei and his master move their camp as the flowers bloom and die.

6 . 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。

The Hong Kong-Zhuhai-Macao Bridge (HZMB), the     1     (eight) wonder for the 21st century, opened on the morning of October 24th, 2018. The bridge links three areas, making     2     much more convenient to travel from one to another. Since opening, the three-hour drive     3     Hong Kong, Zhuhai and Macao     4     (shorten) to 30 minutes.

The project involved more than 400 new patents, broke seven world records, and featured     5     (independent) developed key techniques and design. After an 8-year struggle, the success of the HZMB achieves     6     several generations have been dreaming of, and amazes the whole world with its demonstration of perfect skills and high-level Chinese standards. The bridge is intended to be     7     (rely) for more than 120 years. From the Belt and Road Initiative to "Created in China", there is always a group of people     8     (provide) strong technical support for each of the country's huge projects. From the beginning in December 2009 to the day of the official opening, all     9     (walk) of life made great contributions to the design and construction of HZMB, contributing "    10     (wise) of China".

7 . 语法填空

In 1940, four teenage boys and their dog were walking through the woodland close to Lascaux when their dog suddenly disappeared. The boys searched all around. They came to a cave and looked into the cave     1     could see nothing.

A few days later, the boys returned to the cave. They could hardly believe     2     (they) eyes. In the weak lamplight, the boys saw red horses and cows, and black bulls and deer covering the walls of the cave, which looked so     3     (frighten) that the boys escaped in fear. Little did the boys know that they had made one of the most important     4     (discover) of that century.

The famous Lascaux Cave is made up of a large hole and     5     series of connecting caves, with a natural water system. The paintings there are an especially important find because they are so numerous and so well protected. After a few years, the caves were opened     6     a tourist attraction, and 1,200 people per day came to the site     7     (admire) the paintings.     8     (fortunate) , a large number of visitors resulted in changes in the caves’ atmosphere, and green algae (藻类植物) began to grow around the walls. Since then, the caves     9     (close) to the public in an effort to protect the fragile paintings in this precious underground site.

Today, the caves have computer-controlled air-conditioning and are inspected daily. Scientists hope that these precautions (预防措施) can prevent any     10     (far) damage to the paintings.

8 . As trees across the northern areas turn gold and deep red, you can find autumn colors in parks and woodlands, in the cities, countryside, and mountains. People are wondering what these colors are for. For years, scientists have worked to understand the changes that happen to trees in the autumn. Up to now there have been different explanations for why natural selection makes autumn colors so widespread.

Dr. Hamilton from Oxford University proposed that bright autumn leaves contained a message: they warn insects to leave them alone. In autumn, insects choose trees where they will lay eggs. When the larvae（幼虫）come out the next spring, they feed on the trees, often with a result of destruction of the trees. Dr. Hamilton suggested that trees could ward off these insects with poisons. They could have strong defenses by letting egg-laying insects know what was in store for their eggs.

Dr. Hamilton and students turned the theory into a mathematical model, which showed that warning signals could indeed drive the evolution（进化）of bright leaves. It was a first attempt to see what was out there.

A research team from the University of Wisconsin gave a quite different explanation. “If you are up here in Wisconsin, by the time leaves change, all the insects that feed on leaves are gone.” Dr. Hoch said. He believed that autumn colors served mainly as protection.

According to Dr. Hoch and his team, autumn colors might be able to protect the leaves from sun damage or frost（冰冻）injury—in other words, they actually act as a sunscreen to avoid the destruction to the leaves. Besides, autumn colors might protect the leaves from water loss. If the cells in the leaves become dry, the connections between the cells will be weakened and leaves will break off.

Although there are different explanations about autumn colors, it has really given them a deeper concern for this time of year. “People sometimes say that science makes the world less interesting by just explaining things away,” one famous biologist said. “But with autumn leaves, the more you know about them, the more amazed you are.”

1. According to Dr. Hamilton, there is a connection between________.

A．the size of leaves and the survival of insects

B．the size of leaves and the behavior of insects

C．the size of leaves and the quality of insects

D．the size of leaves and the number of insects

2. Dr. Hoch and his team give the explanation that_________.

A．Climate has an influence on the color of the leaves

B．Sun damage and frost injury drive the insects away

C．the color of autumn leaves has a protective function

D．Autumn colors bring great destruction to the leaves

3. The underlined phrase “ward off” in Paragraph 2 probably means_______.

A．catch

B．attract

C．ignore

D．prevent

4. Which of the following can be the best title for the passage?

A．The evolution of colorful leaves

B．The secret to autumn leaves’ changes

C．The charm autumn colors

D．The role of leaves’ being protection

9 . With the Covid-19 virus sweeping the globe, the science on quitting smoking offers welcome news for smokers who want to build up their defenses in case they contract the virus. Though it may still take many months for a smoker's lungs to heal from damage caused by long-term smoking, your health can noticeably improve in the days and weeks after quitting in ways that could make a difference against the virus. Covid-19 creates an added sense of urgency, and there's enough reason to believe that quitting smoking during the pandemic（流行病）could increases your opportunities of fighting off the virus.

If you make the decision to quit, the cilia（纤毛）in your lungs are one of the first parts of your body to heal. These hair-like projections wave back and forth like a brush as air moves in and out of your lungs. They help your body fight off colds and infection. They also help clear mucus（黏液）, so if they're not functioning as well as they should, mucus can build up in the lungs. Your body's tendency to cough during an infection helps inspire the bodily process of clearing out mucus. That's vital in fighting the Covid-19 condition. The elderly are at a greater risk for too much lung fluid that often limits breathing following coronavirus infection because they don't have a strong enough cough to clear it up.

A second short-term gain from quitting smoking comes from reducing ongoing inflammation（炎症）in your body, which can make you infect Covid-19 more easily. Having your lungs in as good of shape as you can in case of a corona virus infection is key.

Besides lung-related issues, quitting smoking can also deliver healthy benefits to the heart that could help prevent possible heart attacks, which are another cause of death in Covid-19 cases. After you quit smoking, your blood becomes thinner and less possible to setting. Heart attacks are less likely. One reason this happens is because smoking makes it harder for the heart to distribute blood throughout the body.

1. What is the use of the lung cilia?

A．Cleaning up the lungs.	B．Killing the Covid-19 virus.
C．Predicting lung infections.	D．Reducing breathing difficulty.

2. Why are the old at higher risk to the corona virus?

A．They cannot go out during the pandemic.	B．There is too much mucus in their lungs.
C．Most of them are heavy smokers for years.	D．They are lacking in the care of their children.

3. What good does quitting smoking do to heart？

A．Strengthen the heart muscle.	B．Turn blood to be much thicker.
C．Make the blood flow smoother.	D．Speed the heartbeat up apparently.

4. What is the text mainly about？

A．Quitting smoking can help defend the Covid-19.

B．Ways to make a difference against corona viruses.

C．The Covid-19 virus is threatening humans worldwide.

D．Protecting the smokers' lungs to heal from damage.

10 . 阅读下面材料, 在空白处填入适当的内容或括号内单词的正确形式。
Scientists have discovered that    1    (stay) in the cold could help us lose weight. Researchers at the University of California found that exposure to the cold increases levels of a protein that helps form brown fat--the type of fat that produces heat and keeps us warm. Brown fat burns energy,     2    helps us lose weight. White fat stores extra energy, which results     3    weight gain. The researchers said that because air conditioning and heating give us constant,     4    (comfort) temperatures, our body’s need for brown fat has decreased. They found that: “Outdoor workers in northern Finland who    5    (expose) to cold temperature have    6    significant amount of brown fat when    7    (compare) to same-aged indoor workers.” The research was conducted on two different control groups of mice.     8    group was injected with the protein that helps create brown fat. This group later gained 30% less weight after both groups were fed high-fat diets. The researchers say this could be good news in the fight against obesity. People who are obese have    9    (low) levels of brown fat than thinner people. Head researcher Hei Sook Sul said, “This protein could become an important target for research into the treatment and prevention of obesity and obesity-related diseases.” She added, “If you can somehow increase levels of this protein, you could    10    (possible) lose more weight even if eating the same amount of food.”