单项选择题
A.echo "My age is ".$age；B.echo "My age is $age"；C.echo ’My age is $age’；D.echo "My age is "."$age"；
A.$str1< $str2&&$num1< $num2B.$str1>$str2&&$num1< $num2C.$str1< $str2∥$num1< $num2D.$str1>$str2∥$num1>$num2
A.//、’、/*...*/B.//、#、/*...*/C.\\、#、/*...*/D.//、#、/*