题干
A pet ________ is playing with a ball under the tree. It might be Peter's.
A：pigs
B：dog
C：beef
D：cats
答案(点此获取答案解析）
B
A pet ________ is playing with a ball under the tree. It might be Peter's.
A：pigs
B：dog
C：beef
D：cats
+6x-10的值是一个（ ）
