题目

Look! There is an ant on your desk! Which of the following is correct for the underlined word in the sentence?A./ent/ B./ænt/ C./ɑ:nt/ D./ʌnt/ 答案：【答案】B【解析】句意：看！你桌上有只蚂蚁！下列哪一项对句子中划线的单词是正确的？单词ant音标是/ænt/，故选B。 椭圆(θ为参数)的焦距为(    )     A．2      B．      C．2       D．2