单选题：______ be laughed at by his mates, he kept about quiet abou..

It’s time you changed your attitude _____ women now, Tom; they hold up half the sky, you know.A．towards B．fromC．withD．in

Scientists are convinced ______ the positive effect of laughter ______ physical and mental health.A．of；at　　　B．by；inC．of；on　　　D．on；at

In copying this paper, be careful not to leave _______ any words.A．asideB．forC．outD．off

Jack looked very calm ________ the quarrel with his desk mate.A．due toB．because ofC．as a result ofD．in spite of

It is said ______ vegetables and fruits are good to our health, apples and pears _________.A．that, includingB．what, includingC．that, includedD．what, included