Toward the end of the season, Mafall invited me to where he lived-finding many of the players there, I learned that most of them were born with disabilities. When chatting I knew something had changed. They were no longer beggars. They were basketball players, my guys, and my friends.

24.It can be inferred from the text that the disabled young men_________.

A. played basketball as well as normal guys.

B.often helped the local charity.

C.were not friendly toward foreigners

D. used to beg in the streets

25.Why did the writer walk by the young men with head down?

A.To be afraid of being recognized by them.

B.To prevent himself from being stolen.

C. To be careful enough to find his way home.

D. To be afraid of being cheated by them.

26.Why did the author call the disabled young men"my guys"?

A. They were loved by the author.

B. They often played tricks on the author.

C.They used to cheat others when begging.

D.They always quarreled while training.

27.What is the whole text mainly about?

A.The author refused to be cheated by beggars in Dakar.

B.The author helped the locals in Senegal out of poverty.

C. The author helped to change some disabled young men in Dakar.

D. The author coached the young men in Senegal to play basketbal1.

　　 C

Imagine you're standing in line to buy an after-school snack at a store. You step up to the counter and the cashier scans your food. Next, you have to pay. But instead of scanning a QR code (二维码) with your smartphone, you just hold out your hand so the cashier can scan your fingerprint. Or, a camera scans your face, your eyes or even your ear.

Now, this type of technology might not be far away. As technology companies move away from the traditional password, biometric security (生物识别技术), which includes fingerprint, face and voice ID, is becoming increasingly popular.

In 2013, Apple introduced the iPhone 5s, one of the first smartphones with a fingerprint scanner. Since then, using one's fingerprint to unlock a phone and make mobile payments has become commonplace, bringing convenience to our lives. And since last year, Samsung has featured eye-scanning technology in its top smartphones, while Apple's new iPhone X can even scan a user's face.

Biometrics are good; in practice, not so much. when introducing the new iPhone's Face ID feature ,Phil Schiller, Apple's senior vice president, said, "The chance that a random person in the population could look at your iPhone X and unlock it with their face is about one in a million." And in a video posted on community website Reddit on Nov 3, two brothers showed how they were each able to unlock the same iPhone X using their own face, Quartz reported. And they aren't even twins.

　　Anil Jain, a computer science professor found a way to trick biometric security. Using a printed copy of a thumbprint, she could unlock a dead person's smartphone for police, according to tech website Splinter. "It's good to see biometrics being used more," Jain told CBS News, "because it adds another factor for security. But using multiple security measures is the best defence."

28.What is the latest technology to unlock a smartphone according to the article?

A.QR code scanning.