试题题干
In each of the following groups of words, there are four underlined letters or letter combinations marked A, B. C and D. Compare the underlined parts and identify the one that is different from the others in pronunciation.
参考答案
正确答案：
试题解析
本题考查划线部分的发音。
world：[wɜːld]；force：[fɔːs]；horse：[hɔːs]；north：[[nɔːθ]。故A选项world中的or发音与其他三个不同。