在丰富的色彩天地中，黑、灰、白色被称为（）色
参考答案：无彩
To my disappointment, the TV set I had ____ was out of order again. It’s a waste of money.
A．repaired
B．repaired it
C．had repaired it
D．had repaired
按照构成人体的结构层次排序，正确的是
A．④→②→①→③→⑤
B．①→②→③→④→⑤
C．⑤→①→③→④→②
D．②→①→④→③→⑤
