A、Shrinking potato farming. B、Heavy reliance on import. C、Widespread plant disease. D、Insufficient potato supply. D题干问的是日本现在面临着什

Potato chips in Japan are being sold for 6 times their normal price. (5) 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 and more than 3 decades. Local media reports suggest Calbee and its main rival Koikeya 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. Japanese laws limit the amount of imported potatoes that can be used in Japanese made products. (6) 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.
Questions 5 to 7 are based on the news report you have just heard.
5. What problem is Japan facing?
6. Why does Japan limit the import of potatoes?
7. What might affect Japanese domestic produce?