C．Its molecule.

　　D．How you use it.

　　69．Which of the following might be a better choice to make a healthy salad?

　　A．Refined walnut oil.

　　B．Safflower oil.

　　C．Unrefined olive oil.

　　D．Sunflower oil.

　　70．Healthy oil can become unhealthy if________ according to the passage.

　　A．you keep it for too long

　　B．it is heated well beyond its smoke point

　　C．it is refined

　　D．its flavor is changed

　　71．The author wants to tell readers that________.

　　A．oils are related to health

　　B．oils’ value depends on their smoke points

　　C．“certain oils are healthier” is relative

　　D．oils’ flavor and nutrition are connected

　　E

　　(2010·成都第二次诊断)

　　MS，multiple sclerosis (多发性硬化症)，is not easy to say.Those who suffer from the disease may also have difficulty naming it.One sign of multiple sclerosis is losing the ability to speak clearly.It is estimated that more than 2.5 million people worldwide suffer from multiple sclerosis.

　　MS is a disease of the brain and spinal cord (脊髓)．In patients with MS，the covering of the nerves is destroyed.This temporarily blocks signals that pass through the nerves to the muscles of the body and back to the brain.The disease especially affects the ability to see，the sense of touch and the use of the arms and legs.Most forms of MS are described as progressive.This means that the disease gets worse as time passes.

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