单项选择题

Fish resources are diminishing because ______.

A．no new substitutes can be found in large quantities
B．they are not owned by any particular entity(实体)
C．improper methods of fishing have ruined the fishing grounds
D．water pollution is extremely serious

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热门试题

单项选择题

The award-winning beach house is quite strong because ______.

A．it is strengthened by steel rods
B．it is made of redwood
C．it is in the shape of a shell
D．it is built with timber and concrete

单项选择题

Huff raised the house 2.7 meters off the ground on timber pilings in order to ______.

A．withstand peak winds of about 200 km/h
B．anchor stronger pilings deep in the sand
C．break huge sea waves into smaller ones
D．prevent water from rushing into the house