1.C.imagine (culture IS变成culture AS比较好)
2.B.difficulty (difficulties)
In fact,THOSE symbols are (没有not) only one small part of THE American culture
3.C.for (SHORT for)
4.D.developed
5.C.world (not would)
6.A.America (不是USA因为前面没有the)
7.B.lead
8.C.with (LIFEstyle even..)
9.B.around (world)
10.B.the most
11.A.language (world)
12.B.business
13.A.because (没有of)
14.A.means
15.D.english-speaking
16.A.much easier
17.C.is
18.D.real
19.D.something
20.C.further
注意句首要大写.