A.publishers usually spend a year researching information needed for their books
B.many publishers still prefer an already crowded market for their books
C.publishers' actions may prove incomprehensible to lay people
D.some publishers find almost as many resources to the update and redesign of their books as to the creation of them

A.satisfying
B.disappointing
C.worthless
D.frustrating

A.Guidebooks Flourishing Despite the IT Revolution?
B.Enjoying a Paperless Holiday
C.Guidebooks in Decline: What's the Future?
D.Guidebooks on the Brink of Extinction

A.Guidebooks Flourishing Despite the IT Revolution?
B.Enjoying a Paperless Holiday
C.Guidebooks in Decline: What's the Future?
D.Guidebooks on the Brink of Extinction

A.Don't mention it
B.That's nice of you to say so
C.I'd love it
D.I couldn't agree more

A.No way, sorry.
B.Just round the corner over there.
C.Look it up in a dictionary!
D.There's no traffic near here.

A.inequalities
B.developments
C.advantages
D.outcomes

A.most of the world's urban expansion is taking place in slums
B.too many people hope for a better life in cities
C.employment opportunities in cities are greater
D.poverty cannot be eliminated thoroughly

A.NaAlO2.
B.AlCl3.
C.Al2O3.
D.Al2(SO4)3.

A.Na, K.
B.Be, Na.
C.Cr, K.
D.Na, Fe.