已知如下 FOR i:= n DOWNTO 1 DO {语句1} BEGIN x:=x+1; {语句2} FOR j:=n DOWNTO i DO {语句3} y:=y+1; {语句4} END; 语句1 执行的频度为(__);语句2 执行的频度为(__);语句3 执行的频度为(__);语句4 执行的频度为(__)。
【简答题】There are lots of small things we can do to ___1___ in people's lives. In 2010, 12-year-old Blare Gooch was watching TV when he saw a news ___2___ about the Haiti earthquake. On it, a young boy was cr...