A. clear out of everything in the system
B. make a random selection of network
C. get rid of potential spyware
D. refresh the infected system
49. Which of the following is the improper way to shop online?
A. Adopting a unique password for every website.
B. Shopping online at reliable websites.
C. Keeping credit details safe by checking security symbols.
D. Monitoring credit card by storing information.
C
They don’t quite know how to cope with all the dam trouble they’ve got down in Hampden, Maine. And according to town manager Leslie Stanley, it doesn’t look as if things will improve any in the immediate future. “We’ve got a real annoying problem on our hands,” he says.
The annoyance began in late May. About three miles outside of town a group of beavers (河狸) built a dam near the mouth of a culvert (涵洞) that carries a stream under Canaan Road. Some 50 feet of roadway and several hundred feet of land on each side of the culvert were flooded. Stanley sent a road crew out to level the dam. The beavers rebuilt it. The crew tore it apart again. In fact, they tore it apart for ten mornings-and for ten straight nights the beavers rebuilt it.
On the eleventh day, the foreman tossed (扔) the problem back to the town manager. He, in turn, tossed it on to the local game warden (狩猎监督官). The warden, absorbed in beaver knowledge, moved quietly and carefully out one night and placed a petrol-soaked bag over the dam. (Any beaver expert will tell you the creatures just can’t tolerate petrol smell.)
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