In human, color blindness is caused by sex linked recessive genes, while blue eye is caused by autosomal recessive genes. A blue eyed woman whose father is color blind marries a brown eyed man whose mother is blue eyed. How many of their sons are blue eyed? ( )
A: 1/2
B: 1/3
C: 1/4
D: 3/4
A: 1/2
B: 1/3
C: 1/4
D: 3/4
C
举一反三
- 若定义enum color {red=2, yellow, blue, white};那么blue的值为___________。 A: 0 B: 2 C: 3 D: 4
- 下列哪一项是CSS正确的语法构成？（ ）。 A: body:color=blue; B: {body:color:blue;} C: body{color:blue;} D: {body:color=blue;}
- 以下定义枚举类型正确的是() A: enum<br/>color={red, yellow, blue}; B: enum<br/>color={“red”, “yellow”, “blue”}; C: enum<br/>color{“red”, “yellow”, “blue”} D: enum<br/>color{red=3, yellow, blue};
- Which color indicates the harmony between nature and human-beings? A: red and green or blue B: dark blue and yellow or brown C: blue and red or orange D: black and purple or pink
- 以下选项中不能正确把 cl 定义成结构体变量的是 ______ 。 1 ． typedefstruct {intred; int green; int blue; } COLOR; COLOR cl; 2 ． structcolor cl { int red; int green; int blue; }; 3 ． structcolor { int red; int green; int blue; }cl; 4 ． struct {int red; int green; intblue; }c1;
内容
- 0
假设定义了：enum color {red=1, orange, yellow, green ,blue, purple, black};则blue的值是（
- 1
下面对枚举变量的定义中，正确的是( )。 A: enum color {red, blue, grenn} a, b; B: enum color={red, blue, green} a,b; C: enum color={"red", "blue", "green"} a, b; D: enum color {red, blue, green} a, b;
- 2
p, span, .blue, #blue { color: blue; }格式属于（ ）选择器。 A: 标记 B: class C: id D: 群组
- 3
下面span标签中HelloWorld字体的颜色是:()span{color:green;}.red{color:red;}#blue{color:blue;}HelloWorld A: green B: red C: blue D: black
- 4
如设置超链接的样式：当被访问过的超链接为蓝色样式其样式代码为（） A: AA:link{color:blue;} B: a.AA:visited{color: blue;} C: a.AA:hover{color: blue;} D: a.AA:active{color: blue;}