根据中文提示写出单词或词组,使句意完整、正确。 You should ____(注意)to your handwriting.Robots can make people____ (懒惰的).Let's work together to ____(保护)our would.You have a toothache. You should go to see a ____(牙科医生).My mother likes ____(种植)flowers in the garden.
Linda's aunt and uncle _______ workers.
竞争是基于一定的规则进行的,我们在竞争中必须遵守的基本准则是( )
已知下列命题:
(1)若x=a,则x2﹣(a+b)x+ab=0
(2)若a>b,则a2>b2
(3)平行四边形是中心对称图形
(4)圆内接四边形的对角互补.
其中原命题与逆命题均为真命题的有( )个.