The message can be set to reappear every 30 seconds，no matter how many times the thief closes it. “One customer sent a message saying，‘You are being tracked. I am right at your door’，” said Carrie Hafeman，chief executive of the company which produces the program，Retriever.

　　In the latest version，people can add a spoken message. For example，the laptop’s speakers will say: “Help，this laptop is reported lost or stolen. If you are not my owner，report me now.”

　　The Retriever software package，which costs $29.95 but has a free trial period，has the functions of many security software programs. Owners can remotely switch to an alternative password if they fear that the thief has also got hold of the access details.

　　If a thief accesses the Internet with the stolen laptop，Retriever will collect Information on the Internet service provider in use，so that the police can be alerted to its location.

　　Thousands of laptops are stolen every year from homes and offices，but with the use of laptops increasing，the number stolen while their owners are out and about has been rising sharply.

　　Other security software allows users to erase data remotely or lock down the computer.

　　72．The expression “to give the thief a piece of their mind” can be understood as “________”．

　　A．to give the thief an alert mind

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