一个四棱锥和一个三棱锥恰好可以拼接成一个三棱柱.这个四棱锥的底面为正方形,且底面边长与各侧棱长相等,这个三棱锥的底面边长与各侧棱长也都相等.设四棱锥、三棱锥、三棱柱的高分别为,,,则( )
Maybe you have travelled to many parts of the world, but nowhere else _____ striking attractions.
Sometimes I can’t help wondering what’s the matter with Tom.I can’t stand it that he often_____ me and talks with the other students around him.
Creating better health care, education and housing for everyone is a simple idea, but ____ which is hard to put into practice.
Cars play an important role in modern life, but they_______also cause many problems like air pollution.
It was in the beautiful park____was located by the sea____we first met our new Chinese teacher.