A．Nokia­6010

Price: $24.99　Color display: Yes

Wireless Internet ready: Yes

Digital camera: No　2­way text messaging: Yes

Talk time: Up to 330 minutes

Standby time: Up to 240 hours　Weight: 5.08 ounces

Dimensions: 4.68″×1.97″×0.90″

Games: Backgammon, Bowling, Air glide, and Sky diver plus downloadable Java games

B．Motorola­C650 (Camera phone)

Price: $99.99　Color display: Yes

Wireless Internet ready: Yes

Digital camera: Yes　2­way text messaging: Yes

Talk time: Up to 210 minutes

Standby time: Up to 215 hours　Weight: 3.10 ounces

Games: Downloadable games

C．Samsung­V1660 on Sprint PCS

Price: Free　Color display: Yes

Wireless Internet ready: Yes

2­way text messaging: Yes

Talk time: Up to 204 minutes

Standby time: Up to 168 hours 　Weight: 3.54 ounces

Memory locations: 200 entry phonebook

D．Motorola­SLVR­L7

Price: $206.4　Color display: Yes

Wireless Internet ready: Yes

Digital camera: Yes　2­way text messaging: Yes

Talk time: Up to 450 minutes

Standby time: Up to 345 hours　Weight: 3.39 ounces

Dimensions: 4.45″×1.93″×0.45″

Games: Enjoy preloaded J2ME games or downloadable games

E．Nokia­8010

Price: $124.99　Color display: Yes

Wireless Internet ready: Yes

Digital camera: No　2­way text messaging: Yes

Talk time: Up to 330 minutes

Standby time: Up to 240 hours　Weight: 4.08 ounces

Dimensions: 3.68″×1.27″×0.70″

Games: Downloadable games

F．Kyocera­SE47 slider on version wireless

Price: $149.99　Color display: Yes

Wireless Internet ready: Yes

Digital camera: No　2­way text messaging: Yes

Talk time: Up to 210 minutes

Standby time: Up to 100 hours　Weight: 3.39 ounces

Memory locations: 200 entry phonebook

以下是五个人的信息介绍。请将这五个人与他们需要的最佳款式的手机匹配起来。

小题1:Susan is at a middle school.Her parents want to buy her a cheaper cell phone without games installed.

小题2:Mike intends to buy a phone with longer talk time and standby time and it can not be expensive.

小题3:Jane is at college.She would like to buy a phone which can slide the face up to make a call, and slide it down when you're done and it has to be light.

小题4:George would like to have a cheaper phone with digital camera.

小题5:Tom only buys Nokia.He lost one and he wants to buy another which is smaller.

数字证书的作用是证明证书用户合法地拥有证书中列出的（　　　）

A．私人密钥

B．加密密钥

C．解密密钥

D．公开密钥