【推荐1】Many animals show amazing signs of intelligence.

Dolphins

Dolphins may be the smartest sea creatures. Some dolphins can remember others they haven't seen in 20 years! Also, dolphins use teamwork to solve problems, during which they “chatted” about the tasks by making sharp sounds. Dolphins are skilled at using tools. For example, some dolphins wear sea sponges(海绵)on their mouths to protect themselves when they look for food along the rough seafloor.

Chimpanzees

Chimpanzees are known for their wisdom. In 1960, chimpanzees in Africa were the first animals observed to use tools. They could use sticks to catch ants, which they often learn by watching others. Some chimpanzees have even matched humans on tests of their brainpower. They learned to play rock - paper scissors as well as a 4- year -old child. And in a memory test, a chimpanzee remembered a series of numbers twice as well as a group of college students did !

Elephants

Elephants have the largest brains of any land animal. Like humans, elephants can find solutions to difficult problems. In one test, an elephant could roll a box under the tree and then stand on it to reach a piece of fruit hanging from a high branch. In the wild, elephants use their trunks(象鼻)to grasp a variety of tools. They also have excellent memories. African elephants can remember routes to water sources they haven't visited for years.

Octopuses(章鱼)

Octopuses have a central brain and a complex nervous system that enables each of their eight arms to move independently. The octopus was the first invertebrate(软体动物)seen to use tools. It carries seashells or broken coconut shells and hides inside - either for protection from enemies or to hunt for other animals.

【推荐3】You’ve probably felt it at some point in life: a red face, a huge heart, and a coating of sweat on your palms. That intense feeling, also known as an adrenaline (肾上腺素) rush, is caused by stress, nervousness, or excitement.

What happens to the body in any of those scenes is the same. “The special phenomenon begins in organs called adrenal glands(肾上腺). They secrete (分泌) the hormone adrenaline, preparing your body to take action”, says Alan Goodman,a professor of biological anthropology (人类学) at Hampshire College in Massachusetts. “The chemical helps you respond in high⁃risk situations—and even to fight or flee.”

In fact, as soon as your brain senses danger, it tells your body to start making adrenaline. The hormone floods into your bloodstream and jumps into action by connecting to adrenoceptors, which can be found in cells in almost every organ.When a large amount of the chemical is produced all at once—more than 10 times higher than when you’re calm—it’s called an adrenaline rush.

That flood has lots of noticeable effects, and each one is intended to protect you in a dangerous situation. Your pupils might widen to let more light into your eyes so you can see more of your surroundings. Your brain begins to work faster to draw up a plan. Your heart beats more rapidly and pumps extra blood to your muscles, also delivering a surge of oxygen from your lungs. All of these effects build up anxious feelings. That’s why it might seem as if your head is spinning, your thoughts are racing, or your heart is beating out of your chest.

【推荐1】If you use “123456”, “password’’ or “qwerty” as a password, you’re probably aware that you’re at the risk of being attacked by hackers (黑客). But you’re not alone.     1     Recently, password management service NordPass has carried out a study to determine the 200 most commonly used passwords around the world. They analysed the data across 50 countries.

The findings show password choices are often attached to cultural references.     2     In the UK, “liverpool” was the third most popular password, with 224,160 hits, while the name of Chilean football club “colocolo” was used by 15,748 people in Chile, making it the fifth most common choice.

    3     Women tend to use more positive and affectionate (深情的) words and phrases such as “sunshine” or “I loveyou”, while men often use sports-related passwords. In some countries, men use more swear words than women.

Choosing long and complex passwords remains the main authentication mechanism (身份验证机制) for computers and network-based products and services. But we know people continue to choose weak passwords and often don’t manage them securely.     4    

To overcome the security issues linked with password-based authentication systems, researchers and developers are now concentrating on creating authentication systems which don’t depend on passwords at all.     5     For example, two-factor authentication (2FA) and multi-factor authentication (MFA) methods are good ways to secure your accounts. These methods combine a password with biometric information (for example, a face scan or fingerprint) or something distinguishable, like a captcha (验证码). All in all, a secure password is the first line of defense against cyber attacks. Don’t give up security for convenience.

【推荐2】As science and technology have developed, our lifestyle experienced changes. From the first telephone to the first medical drug (药物) every invention has significantly affected lifestyle across the world.     1     Let us take a look at some areas of lifestyle where the Internet has played a significant role.

The Internet has changed the idea of shopping in our lives. The Internet has made it possible that you can choose and buy a product from different sellers at the same time.     2     You can also enjoy very good bargains (减价品).

For people who love traveling, the Internet is a friend in need and service. Now, we can make use of the power of the Internet to know more about travel destinations and even organize travel plans online. You can book hotels, tickets, and travel packages online.     3    

With the wide use of the Internet today, even education is now possible from the comforts of your home. If you have an Internet connection and a computer, you can easily join an online education program.     4    

    5     There are numerous sites that offer you the opportunity to search for your favorite job. You can get useful information about job opportunities. The Internet provides you with detailed and useful information about jobs.

Apart from these examples, there are lots of other areas where the Internet has worked wonders. With the development of science and technology, more and more areas are influenced by the Internet and the boom(繁荣)is expected to continue with the passage of time.