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( )
By the time a child is five, he _______ hundreds of hours of television.
There is nothing wrong with using a credit card for purchases. It’s more _______ than carrying loads of cash.
An earthquake of 9 magnitude struck off the coast of Japan on Friday,______ thousands of people dead and more missing.
Don’t touch your eyes, nose and mouth, because they aren’t covered by skin and can _______ the virus more easily.
A truly rich man is a person _______ children run into his arms when his hands are empty.