This boy is Peter .He is from America.He is ten years old . His hair is yellow.Peter can play basketball. This is his school.It's very big. There are forty students in his class. Miss White is his English teacher. Peter is good at English.
我看了看他的手,那是一只满是皱痕的水手的手。我又看了看他的脸,那是一张又老又穷苦的脸,满脸愁容,狼狈不堪。我心里默念道:“这是我的叔叔,父亲的弟弟,我的亲叔叔。”
若a、b为两个有理数,且ab<0,a+b<0,则( )