题目

若，，，的方差为，则，，，的方差为（    ） A.               B.              C.            D.   答案：DComplete the sentences with the given words in their proper forms:【1】Tom became famous in her______(forty).【2】Tu Yoyo is the first Chinese______to win a Nobel Prize in science.(city)【3】We must be responsible for_______ for others and for society. (we)【4】The boy is quite________. He always tries to finish the tasks by himself.(depend)【5】Cormorant fishing is a_________Chinese skill as well as paper cutting (tradition)【6】I'm sure you will_____ in working out the problem unless you give up.(success)【7】Walk______along the street and you will see the market in five minutes.(straight)【8】The fans all felt very sad about the______of the famous actor.(dead)