以下代码的运行结果是____。$colors = array("black","blue",4=>"red");echo $colors[2]; A: black B: blue C: red D: 没有输出。出现警告性错误提示。

6. Which of the following is NOT the way to use colors effectively?‎‌‎ A: To use colors that highly contrast B: To use colors consistently C: To stick to a limited number of colors D: To use colors that make slides fancy

In the use of colors, the color may be used chiefly and other colors may be used supplementally,or balanced colors may be used.

The three colors that cannot be made by mixing any other colors are called____ colors.

Which of the following colors are the core colors of Chinese traditional colors? A: black and white B: red and cyan C: yellow and blue D: purple and orange

In the color circle, a primary color and the corresponding secondary<br/>color (such as red and green, yellow and purple, blue and orange) are<br/>called ( ). A: Intermediate colors B: Three primary colors C: Compound colors D: Complementary colors

According to the different levels of warmth sensed by people through colors, colors can be divided into cool colors and warm colors. Which of the following colors can make people feel warm ( ). A: Red B: Pink C: Green D: Purple

In the use of colors, the( )color may be used chiefly and other colors may be used supplementally,or balanced colors may be used. A: black B: yellow C: blue D: green

名为colors的列表包含200种颜色，现在需要从第2种颜色开始，[br][/br] 每隔1种颜色间隔显示。 [br][/br] 下列哪个选型是正确的？ A: colors[1:2] B: colors[::2] C: colors[2:2] D: colors[1::2]

中国大学MOOC: Why are just two black and white colors preferred to multiple colors in paintings?