Questions 6 is based on the news report you have just heard.

    (5) Potato chips in Japan are being sold for 6 times their normal price. This is after the country’s main manufacturer stopped sales due to a potato shortage. Storms and floods in its main potato growing region last year caused the worst harvest in more than 3 decades. Local media reports suggest Calbee and its main rival Koike-ya are halting almost 50 products.

    “We don’t know when we’ll be able to restart”, a company spokesman said. Snack lovers are panic buying and many supermarket shelves are bare. (6) Japanese laws limit the amount of imported potatoes that can be used in Japanese-made products. Japan says fear of disease is its main reason to block fresh imports. It still only allows potatoes from selected US states. This is only at certain times and on condition that they are processed at factories based near Japanese ports.

    (7) But global warming has raised the possibility that domestic produce could be seriously affected by rare weather events more often.

6. Why does Japan limit the import of potatoes?

解析：C。根据录音可知，日本法律限制了可用于本国产品生产中的进口土豆量。日本表示，害怕疾病传播是限制生鲜进口的主要原因。故正确答案为C。