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To compete in today’s fast-paced competitive environment, organizations are increasingly allowing contractors, partners, visitors and guests to access their internal enterprise network. These users may connect to the network through wired ports in conference rooms or offices, or via wireless access points. In allowing this open access for third parties, LANs become（）And worms acquired from unprotected public networks． Hackers masquerading as internal users can take advantage of weak internal security to gain access to confidential information． A．damageableB．susceptibleC．vulnerableD．changeable

posers today use a wider variety of sounds than ever before, including many that were once considered undesirable noises. Composer Edgard Varese （）At opposite ends of the stage,in the balcony, or at the back and sides of the auditorium． Because standard music notation makes no provision for many of these innovations, recent music scores may contain graphlike diagrams, new note shapes and symbols, and novel ways of arranging notation on the pagE．What does the passage mainly discuss A．The use of nontraditional sounds in contemporary musicB．How sounds are produced electronicallyC．How standard musical notation has beer, adapted for nontraditional soundsD．Several composers who have experimented with the electronic production of sound