单项选择题
A.如果year大于或等于25,则表达式的值是teacher,否则为student B.如果year 大于或等于25,则表达式的值是student,否则为teacher C.如果year大于25,则表达式的值是teacher,否则为student D.如果year小于或等于25,则表达式的值是teacher,否则为student
A.<td>和</td> B.<style>和</style> C.<body>和</body> D.<th>和</th>
A.link B.visited C.hover D.active