Paper produced every year is           the world’s production of vehicles

A three times weight of                   B three times the weight of

C as three times as heavy                    D three times so heavy as

国家实行限制进口管理的货物、技术，必须依照国家有关规定取得国务院对外贸易主管部门或者由其会同国务院有关部门许可，方可进口。目前，我国限制进口货物管理按照其限制方式划分为许可证件管理、关税配额管理和非配额限制管理。