请先阅读下面短文，掌握其大意，然后从各小题所给的A、B、C、D四个选项中选出可以填入相应空白处的最佳选项，并在答题卷上将该项涂黑（共15小题；每小题分，共15分）
Most of us have three meals a day .We take food for granted(想当然)。And we don’t think about it.      experts argue a food crisis(危机)is coming.This crisis is going to make us      the way we think about food.
Food is in great need     a growing of world population.By 1960,the population was three billion.It doubled to six billion by 1999.By 2050,this planet will need to      at least nine billion people.As a result,the food prices get higher and higher.
So,what can a      ,crowed world do?One suggestion is to eat  __  meat.Meat uses more natural resources(资源)than grains(谷物) .It requires more   __  to produce one pound of meat than to produce one pound of grain. It also requires between 5 and 10 times more      than vegetables. So ,eating less meat will   ___  more land for farming,and it will save water.
To eats less meat,people will need to change their eating habits. That will not be  __   .Americans, for example,have   __  loved meat. In general, They eat twice as much meat as people in other countries.At the same time,in developing countries like China and Brazil,sales of meat have doubled in the last 20 years.   ___  will double again by 2050.Growing need of meat wil1    __   to put pressure on natural resources.
World population is increasing,resources are becoming fewer,and food prices are rising.Therefore, we need to rethink  ___  we eat every day. For meat lovers, we don’t need to give up meat   ___  .But we need to eat more grains and less meat.

A．And B．But C．Or D．Until

A．change B．find C．get D．tell

A．instead of B．thanks to C．because of D．as for

A．help B．have C．feed D．meet

A．busy B．tired C．thirsty D．hungry

A．less B．more C．much D．little

A．time B．land C．people D．place

A．air B．meat C．money D．water

A．provide B．produce C．waste D．need

A．important B．hard C．easy D．necessary

A．never B．seldom C．hardly D．always

A．It B．They C．We D．That

A．continue B．stop C．have D．start

A．how B．when C．what D．where

A．quickly B．completely C．finally D．especially