精选优质文档-倾情为你奉上 三年级英语(下) 选择题( ) 1. Welcome _ the library. A. for B. to C, at ( ) 2. _ oranges. A. This is B. Are these C. These are ( ) 3. Look _ the pictures. A. in B. to C. at( ) 4. _ is this? Shes my sister. A. Who B. What C. Where( ) 5. Whats this? _ A. Theyre apples. B. Its an apple.