下列说法中错误的是（    ）

{a_n}是单调递增的等差数列，前三项的和为12，前三项的积为48，则它的首项是（　　）

组词小火车开动了。（一词组多词）

促—____—____—____

深—____—____—____

遍—____—____—____

    Bob is an English boy. His eyes are blue. Li Ming is a tall boy. His eyes are black. They are good friends. Bob's hair is yellow and Li Ming's hair is black. Li Ming's mom is a Chinese teacher. Bob's mom is an English teacher.她和李明的妈妈在同一个学校。Bob's dad is a doctor(医生). Bob and his dad look different. He looks like his mom. Bob's family are new in China. Li Ming's dad and mom help them(他们). They like their English friends.