Dietary supplements aren't tested in the same way as drugs. There is not always proof that the supplement really does what it is supposed to do. There is also a problem with purity of the supplements. Supplements have been found to contain things that are bad for the body. For example, the California Department of Health found that of 260 herbs grown in China, one third contained heavy metals. These are minerals such as lead and mercury(水银). They are very poisonous, even in tiny amounts.

　　1．The scientists study the cures from the healers in order to________.

　　A．find out if the plant is poisonous

　　B．find out what in the plant works to cure disease

　　C．look for aspirin in the plant

　　D．make sure that the plant can cure disease

　　解析：细节理解题。根据文章第一段内容得知，科学家们先发现用来治病的药

　　物，然后再弄清楚植物到底含有什么成分在治疗中起作用。

　　答案：B

　　2．We can infer from the second paragraph that________.

　　A．it is legal to take dietary supplement in the USA

　　B．supplements are safe because they are natural medicines

　　C．all the supplements are poisonous

　　D．none of the supplements has bad side effects

　　解析：推理判断题。根据第二段可知，在美国吃补药是合法的，其余选项均不符合文意。

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