（）缺陷见于所有树种，但一般阔叶材比针叶材多。
参考答案：弯曲
某服装商店出售一种优惠购物卡，花200元买这种卡后，凭卡可在这家商店8折购物，什么情况下买卡购物合算？
—The boy shows _____ in model cars.
—I think he will be an engineer in the future. [ ]
A. interested
B. interesting
C. much interest
