答案是一个数字：
Key1
program area_;
var
base,height,area:real;
begin
write('base:');
readln(base);
write('height:');
readln(height);
area:=base*height/2;
writeln('area:',area);
end.
Key2
Line 154, Entry 3.
答案：
解析：
May the angels to guide your way
key1：Brad Silberling &Nicolas Cage
key2：city
key3：The Olympic Games
key4：The opening ceremony of the Olympic Games the very next day
key5：Baidu Encyclopedia
标签：
key
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答案：
解析：
