Repeat visitors during a four­month trial will be able to check in(在旅馆登记) using their phones before arrival and have their phones activated(激活) as "keys"．They will then be able to unlock the door by holding the phone next to it.

The short­range radio technology，known as Near Field Communication (NFC)，is expected to be built into smart phones in the coming years.It is also expected to be used for ticketing and card payments.Assa Abloy said it wanted to test the system before expanding(扩展) it to other hotels，commercial buildings and homes.

Greger Johansson，who works at research firm Redeye，said NFC is hot technology in the mobile phone market.But he said few models have used it so far and it will take "several years" before it becomes widely used.

The head of Assa Abloy's mobile keys department，Daniel Berg，said that those who took part in the trial may find it cumbersome(笨重的) to have an extra mobile phone.But once people have the technology in their own phones，he said，it will save them time at check­in and improve safety.He said the phone technology works with existing radio­enabled locks，so hotels can continue giving key cards to visitors who don't have the new technology in their phones.

5．Which of the following customers can take part in the trial?

A．Those who will live in the hotel for four months.

B．Those who carry at least three mobile phones.

C．Those who have stayed at the hotel at least twice.

D．Those who pay for the extra mobile phone.

答案　C

解析　推理判断题。根据第二段首句"Repeat visitors during a four­month trial will be able to check in(在旅馆登记) using their phones..."可知回头客可以参加此次试验，故选C项。

6．From the text we can know that the NFC technology .

A．can only be used in the hotels

B．is still being developed at present

C．has been built into smart phones

D．failed in the experiment for card payments

答案　B

解析　推理判断题。根据第三段最后一句"Assa Abloy said it wanted to test the system before