在自然数1----20中:
是质数又是偶数的数是____,是奇数又是合数的数是____、____.
(从小到大依次填写)
下列物质或能量中,不是自然资源的是( )
下列关于第二次世界大战的进程的叙述不正确的是( )
There is a common saying in China________nothing in the world is difficult for one who sets his mind on it.