给划线字注音。
____
撅着
授粉
昆虫
蔬菜
下列各式的变形,能正确运用等式的性质的是( )
北京和雅安两地自转角速度和线速度比较,正确的是( )
— is it from your home to your school?
— It is about twenty minutes by bike.
有理数2012的相反数是( )