人教版七年级英语上册Unit7 How much are these socks?Section B 1a-1e第3课时课件（该课件内含音频文件）（该课件包含单词语句听力）
判断下列算式正误 (T/F)
( ) 1. twelve + eight = twenty
( ) 2. seven + eight = fifteen
( ) 3. thirty-one + seven = twenty-five
( ) 4. eleven + twenty = thirty-one
( ) 5. twenty-four + nine = thirty-two
