25. The research on the birth of crayfish will be helpful in __________.

① diet ② medicine ③ brain ④ ocean

A. ①② B. ③④ C. ①③ D. ②④

26. Where could the passage be picked from?

　 A. a cookbook B. a science magazine C. an advertisement D. a guide brochure

　　C

　　On some Swedish trains, passengers carry their e-tickets in their hands. About 3,000 Swedes have chosen to put microchips (微芯片) beneath the skin between fingers. The chips, which cost around $150, can hold personal facts, credit-card numbers and medical records. They depend on Radio Frequency ID (RFID), a technology already used in payment cards, tickets and passports.

　　There are 10,000 people with chip implants (植入) around the world. Sweden, home to several microchip companies, has the largest share. People can order do-it-yourself kits. And sometimes they get T-shirts that say "I got chipped".

　　Jowan Österlund, the founder of BioHax, a Swedish firm, argues that chips are safer than mobile phones because it is harder to steal information from them. But some people still have worries. RFID chips do not have GPS, but they leave a trail when they are used to open doors, operate printers, etc. In 2004 a Mexican government official and his workmates had chips placed in their arms that tracked who had accessed important information.

So why take the risk? Less trouble is one reason. The equipment for microchip implants exists wherever new payments are accepted. Sweden is well suited, as the world's second most cash-less country (after Canada).

But the chips have little use unless all companies agree to work together. Few shops recognize this chip implants yet, even those organizations that do have had some troubles in the beginning. When Swedish rail officials began scanning passengers' microchips, they saw private information rather than evidence of ticket buying. For now the chips are used largely as business cards, keys or to store important information.

　　So the desire to win notice or admiration is another explanation. Chip enthusiasts want to equip human bodies with technology. Elon Musk, an American businessman has spent money on this technology that connects machines with human brains, which caused fears from some Christians.

27. What is special about the microchips mentioned in the passage?

A. They have already become part of human bodies.

B. They have offered access to personal information.

C. They have become a symbol of modern society.

D. They have used the latest technology in payment.

28. Jowan failed to consider the fact that __________.

A. the information is safer to keep on chips than phones

B. RFID chips can also have GPS as mobiles phones do

C. information on chips is likely to be accessed and let out

D. some microchips have already been equipped with GPS

29. Why are people willing to risk putting chips into their bodies?

A. Because developed countries are well prepared for chip implants.

B. Because they want to save themselves the trouble of cash payment.