There are many symbols in the world today. Many of these have their roots in history. _31_ , the symbol @ is found on every keyboard in the world. Its modern meaning dates back to 1971, _32_ Raymond Tomlinson used it to identify different computer stations. From there, it has spread to emails, forums, Facebook, and Twitter. _33_ example is the symbol of Bluetooth, which was created by the Swedish company Ericsson. The technology was actually named _34_ a 10th century Danish king, Harald Blatand, who unified Denmark, Norway, and Sweden into a powerful kingdom. The title “Bluetooth” is said to have come about because King Harald ate too many blueberries. The Bluetooth symbol uses Harald’s initials, written in the old runes from that region. These examples _35_ a very good question---where would we be without these symbols? Our world would surely look a lot different. 【題組】32 (A)which (B)that (C)when (D)so
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