I don't like doing the dishes because it's ____ .
A:interesting
B:boring
C:interested
D:bored
①有多种酶参与
②最适合pH是7
③最适温度是40℃
④50℃时酶逐渐失活
⑤0℃时酶逐渐失活.
“国以民为本,民以衣食为本,衣食以农桑为本”这句话是谁说的( )
下列说法不正确的是( )