世界人口稠密地区主要分布在：

A．临海地带

B．高原地区

C．原始热带雨林

D．大陆内部

Almost one half of all Americans have to pay experts,because_______.

A．the list of taxes seems endless

B．they would rather spend their time and energy elsewhere

C．they find their knowledge about taxes is so limited that they are unable to write tax report all by themselves

D．paying experts to prepare their tax report and asking for tax advice have become very popular