①—Is she seven?
—No, she isn't. She's eight.
②— Is she ten?
—Yes, she is.
③— Is she nine?
— Yes, she is.
④—Is she nine?
—No,she isn't. She's seven.
____
下列划线字的注音全都正确的一项是( )
地球半径约为6400000米,用科学记数法表示为( )
下面的图解表示吸气过程中空气进入体内所经过的结构,请填写完整.
①____;②____;③____.
选出与所听内容相符的图片( )