If a small country imposes a tariff on imported motorcycles ( ) A: the surplus of the domestic producers of motorcycles will decline, but the surplus of the domestic consumers will increase. B: the surplus of both the domestic producers and consumers of motorcycles will decline. C: the surplus of both the domestic producers and consumers of motorcycles will increase. D: the surplus of the domestic producers of motorcycles will increase, but the surplus of the domestic consumers will decline.

( )was used as a means of transportation in the early days. A: Snow Motorcycles B: Snowmobile C: Sledge and plough D: Ice bike

We are interested in importing motorcycles and would be grateful if you would send us a copy of your latest catalogue, your price list, and export term.

ThepeoplewholivedinRomethousandyearsagowerealreadycomplainingaboutthenoiseintheircity.Theycouldn’tsleep,theysaid,withallthat(21)_______inthestreets.Forthem,noisewas(22)________adisturbance.Forusishasbecomeareal(23)_______.Weknowthatthesoundsofan(24)______cityareloudenoughtocauseseriousdamagetotheinhabitants’(居民)(25)______--intheUnitedStates,oneoutoftwentyhassufferedsomehearing(26)______.Andallovertheworldthesituationis(27)______allthetime,sincenoiseincreaseswiththepopulation.Ithasalsoincreasedenormouslyinthetwentiethcentury(28)____________.Weliveinanenvironmentsurroundedbyloudplanes,trucks,motorcycles,buses,electrictools,radios,etc.Thatroardayandnightupto90or100decibels(分贝).Unfortunately,thehumaneardoesnotjudgeclearly(29)_________________.Asoundtendecibelslouderthananotheroneisfeltastwiceasloud,wheninfactitistentimeslouder.Sincewecannotmeasuretheincreaseordecreaseofnoise,(30)__________________.