Over a hundred children ______ parents were killed in the Wenchuan earthquake have been adopted and taken good care of by kind??hearted couples. A．whoB．thatC．whoseD．which
People can be addicted to different things— e．g．alcohol, drug, certain foods，or even television．People who have such an addiction are compulsive: they have a very powerful psychological need
_____ that he isn’t adequate to the present job, he devotes all his spare time to studying professional knowledge. A. Concern B. To concern C. Concerned D. Concerning
，那么
的最大值等于 