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1.Your bones are constantly receiving and losing calcium,the

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1.Your bones are constantly receiving and losing calcium,the mineral that-----them strong and break resistant.
2.The process starts to reverse,possibly----osteoporosis.
3.------your risk,while you are still young ,make sure your diet contains-----calcium
4.You can halt or reverse the progression of osteoporosis at virtually----stage
a.makes b.make c.making d.to make
a.result is b.resulting in c.result as d.to be resulting
a.as low as b.it is lower c.lowers d.to lower
a.enough b.sufficiency c.adequately d.necessarily
a.their b.the c.any d.which
1,主语是单数,所以谓语动词要第三人称单数,钙让你的骨骼更强壮,a
2,导致骨质疏松,固定搭配,b
3,主要是看意思,当你年轻的时候,为了降低你的冒险程度,保证饮食中有足量的钙.我觉得第3题,第一个空选d,第二个选a,因为adequately是个副词,这里修饰calcium是个名词,所以用个形容词比较好
4,我觉得选c,这就话的意思是,在骨质疏松的任何阶段你都可以去阻止的