题目内容：

The health of millions could be at risk because supplies of medicinal plants are being used up. These plants are used to make traditional medicine, including drugs to fight cancer. “The loss of medicinal plants is a quiet disaster,” says Sara Oldfield, secretary general of the NGO Botanic Gardens Conservation International.

Most people worldwide rely on herbal (药草制的) medicines which are got mostly from wild plants. But some 15,000 of the 50,000 medicinal species are under threat of dying out, according to report from the international conservation group Plantlife. Shortages have been reported in China, India, Kenya, Nepal, Tanzania and Uganda.

Over-harvesting does the most harm, though pollution and competition from invasive species (入侵物种) and habitat destruction all contribute. “Businessmen generally harvest medicinal plants, not caring about sustainability (可持续性),” the Plantlife report says, “damage is serious partly because they have no idea about it, but it is mainly because such collection is unorganized.” Medicinal trees at risk include the Himalayan yew (紫衫) and the African cherry, which are used to treat some cancers.

The solution, says the report’s author, Alan Hamilton, is to encourage local people to protect these plants. Ten projects studied by Plantlife in India, Pakistan, China, Nepal, Uganda and Kenya showed this method can succeed. In Uganda, the project has kept a sustainable supply of low-cost cancer treatments, and in China a public-run medicinal plant project has been created for the first time.”

“Improving health, earning an income and keeping cultural traditions are important in encouraging people to protect medicinal plants,” says Hamilton, “You have to pay attention to what people are interested in.”

Ghillean Prance, the former director of the Royal Botanic Gardens at Kew in London, agrees that medicinal plants are in need of protection. “Not nearly enough is being done,” he told New Scientist. “We are destroying the very plants that are of most use to us.”

1.From the first two paragraphs, we can learn that ________.

A. millions of people are threatened with-cancer

B. most countries see a shortage of herbal medicines

C. about two thirds of medicinal species will disappear

D. a number of medicinal species are in danger of extinction

2.The major factor that causes the decreasing of supplies of medicinal plants is ________.

A. pollution    B. habitat destruction

C. over-harvesting    D. invasive species

3.The underlined word “it” in Paragraph 3 refers to ________.

A. over-harvesting    B. sustainability

C. other species’ invasion    D. pollution

4.What can be inferred from the passage?

A. Protecting medicinal plants has a long way to go.

B. Ghillean Prance is optimistic about medicinal plants’ future.

C. Local people don’t know how to protect medicinal plants.

D. China has made great progress in protecting medicinal plants.

5.Which of the following is the best title of the passage?

A. Low-cost Cancer Treatment

B. The Importance of Sustainability

C. Medicinal Plants on Verge of Extinction

D. Sustainable Development of the Environment