I had been taking a health ---food store monster multivitamin（综合维生素剂）for months. Coincidentally, I had been experiencing some strange numbness in my legs that was starting to scare me. I remember sitting in a long meeting with ankles crossed, and when I tried to stand up I crumpled on the floor and lit my chin on the glass coffee table because my leg had gone completely numb and worthless. As I sat there and shook my leg, I got that “pins and needles” feeling and soon was OK. But it scared me enough to make an appointment with a neurologist who suggested an MRI to rule out multiple sclerosis, stroke, or a brain tumor.

　　While I’ll never know for sure if the vitamins caused my problem, many, many studies have reminded us that pill forms of vitamins and minerals don’t provide the same benefit as getting them form food. There’s a lot we don’t know about how the human body works. Until we know more, I’m getting of my vitamins from the famer’s market.

　　17．Why do people take folic acid and vitamin B12 supplements?

　　A．They want to stop heart attacks or live longer.

　　B．They want to liver longer.

　　C．They want to increase risk of cancer.

　　D．They want to experience some strange numbness.

　　18．Which of the following is NOT true according to the passage?

　　A．It was the multivitamin he took that caused the writher to get the “Pins and needles” feeling.

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