請依下文回答第 31 題至第 35 題：
        How many times has your heart sunk after dropping your smartphone and worrying if you smashed the glass? Theremay be an answer to reduce that feeling. The glass __31__  to make the screens on many of the world’s smartphonesjust got tougher. The company that makes the glass has just made a stronger __32__ . It is called Gorilla Glass and hasbeen used in smartphones for many years. The company has greatly improved the glass to make it more __33__ toscratch, crack, or smash. The new product can __34__ drops of up to two meters without any signs of damage. It is alsotwo times more scratch- __35__ than other glass. The glass was first used on products by a leading company.
【題組】31
(A) is used
(B) has used
(C) was using
(D) used