Ⅱ. 单项选择（15分）
1. This is______ European snake and that is ______ African snake.
A. a; an B. an; a C. a; a D. an; an
【解析】选A。 考查不定冠词a/an的用法。European是以辅音音素开头的单词，用冠词a；African是以元音音素开头的单词，用冠词an, 故选A。
2. This is my first trip ______ Beijing.
A. in B. to C. at D. for
【解析】选B。句意：这是我第一次到北京旅行。a trip to. . . “到……的旅行”，故选B。
3. Come in, please! Welcome ______ here.
A. to B. / C. from D. for
