【正确答案】 C

【答案解析】man： Hello, Mary. Have you read the news about the contamination of the Australian wool? woman： No. What’s that about? man： Well. We all know that Australia has a valued reputation as a supplier of wool with relatively low content of dark fibre. But now the wool from Australia is in the trouble with contamination. woman： Oh, that's too bad. What happened? man： Contamination of the Australian Merino wool clip has traditionally been associated with dark fibres originating from urine stains and isolated pigmentation found in the fleece. You can say that the wool would be contaminated since sheep were born. woman： And products made by the contaminated wool are bad to humans, I guess? man： Absolutely, the dirty wool would attract unwanted visitors-clothes moths which need dark, dirty, undisturbed areas to survive. If we wear those woolen items, we could get some skin diseases. woman： That's terrible. But if we keep items made from uncontaminated wool in the same dark and dirty environment, are they going to draw moths? man： I am afraid yes. So if you have woolen items, you'd better clean them thoroughly before storing. You can also choose things made from mothproof wool. It's said that many yarn manufacturers make mothproof wool, which is chemically treated to repel or kill moths that come in contact with it. woman： I see. But if the chemical kills moths, what can it do to humans? man： It is relatively harmless if not ingested, and the federal government agrees.

【正确答案】 B

【正确答案】 A