第23题: [单项选择]How many ______ known altogether A. species of fishes are B. species of fish is C. specieses of fish are D. species of fish are 参考答案:D 答案解析:species单复数形式相同,不存在specieses的形式。本句中从意思上判断应为复数,因此后面的动词应用are。而fish通常也没有复数形式变化,虽然有fishes的形式存在,但它只在强调各种不同
第30题: [单项选择]A. To collect benefit. B. To post the parcel. C. To buy some goods. D. To change some money. 参考答案:A 答案解析:[听力原文] Why do many people queue up at the post office according to the conversation