大衣的款式与品种。
参考答案:
根据长短可以分为短大衣、中长大衣和长大衣。根据服装面料的不同,其主要品种有毛呢大衣、棉大衣、羽绒大衣、裘皮大衣、皮革大衣、人造毛皮大衣等。
People living in different countries made different kinds of words. Today there are about fifteen hundred languages in the world, each contains many thousands of words. A very large dictionary, for example, contains thousand words. Before you leave school, you will learn only one thousand or more.
The words you know are called your vocabulary. You should try to make your vocabulary bigger. Read as many books as you can. There are a lot of books written in English for you to read. You will enjoy them. When you meet a new word, find it in your dictionary. Your dictionary is your most useful book.
小题1:The number of different languages spoken is about 1500.
小题2:Before you leave your school, you’ll learn more than three thousand words.
小题3:You must have a large English dictionary to make you know bigger vocabulary.
小题4:If we know about five thousand words, we can read as many books as we like.
已知函数f(x)=x2+bx,则“b<0”是“f(f(x))的最小值与f(x)的最小值相等”的()
A.充分不必要条件
B.必要不充分条件
C.充分必要条件
D.既不充分也不必要条件