单项选择题
A./多行注释/ B.//多行注释 C./*多行注释*/ D./%多行注释%/
A.<script>vara=90;</script> B.<linkhref="alert.js"/> C.<scriptsrc="alert.js"></script> D.<h2onclick="alert(’标题’)"></h2>
A.<buttontype="button"onclick="alert(’Welcome!’)">点击这里</button> B.<script>alert(’hello’);</script> C.<scriptsrc="alert(’hello’);"></script> D.<linksrc="alert(’hello’);"/>
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