题目

You are the collector in the gallery of your life. You collect. You might not mean to but you do. One out of three people collects tangible（有形的）things such as cats, photos and noisy toys. There are among some 40 collections that are being shown at “The Museum Of”—the first of several new museums which, over the next two years, will exhibit the objects accumulated by unknown collectors. In doing so, they will promote a popular culture of museums, not what museums normally represent. Some of the collections are fairly common—records, model houses. Others are strangely bA number of books in the library ___been stolen so that the number of them ___ smaller than before.  A．have, isB．has, isC．has, areD．have, are