下列选项中，用于定义密钥对生成器的标签是（）

A. <input />
B. <label>
C. <keygen>
D. <form>

下列选项中，用于定义输入选项列表的标签是（）

A. <input />
B. <datalist>
C. <select></select>
D. <form>

下列选项中，用于定义下拉列表的标签是（）

A. <input />
B. <textarea></textarea>
C. <select></select>
D. <form>

下列选项中，为下拉列表定义选中项的写法，正确的是（）

A. checked=”checked”
B. selected =”selected “
C. readonly
D. checked

下列选项中，用于为标签定义标注的标签是（）

A. <input />
B. <label>
C. <select></select>
D. <form>

在定义下拉列表时，标签用于定义选项组，必须嵌套在标签中。()

A. 对
B. 错

readonly属性只适用于标签。()

A. 对
B. 错

表单控件应用了readonly属性后，不能进行编辑和修改。()

A. 对
B. 错

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