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Glass is everywhere in our is so common __1_ we hardly think about _2__ it when we look out of the window and if we wear drink from it and sometimes eat from light in our homes comes through glass windows in the daytime and from glass lights _3__s __4_ in homes,schools,businesss,industry,and automobiles.
Fortunately for us,glass is __5_ very inexpensive main material is sand from quatz mixture is heated until it becomes a syrupy _6__. When the liquid cools,it becomes glass.
No one knows __7_ first discovered glass or y humans used obsidian,a natural glass __8_ by volcanoes,to make tools and le probably began making glass themselves around 3000 B.C. in in a war __9_ Egypt and Syria in 1400 B.C,Syria became part of Egyptians took Syrian glassmakers __10_ to Egypt,and over the centuries the entire eastern Mediterranean area became a glassmaking center.
Probably around 300 B.C. the blowpipe __11_. Egyptian glassmakers developed the use of the specialized _12__ beautiful jewelry,dishes,and other containers.
The Romans soon started making their own they _13__ that glass could be used to make windows.__14_ centuries later,Europeans made magnificent church windows __15_ colored glass.
__16_ 1900 companies have developed many new types of ty glass is a sandwich of glass and it breaks,the pieces stay together _17__ flying in all invention is very useful _18__ automobile windows.
Today most glass is made __19_ machines in large one _20__ it. People use television and computers to control the machines.
1) A that B which C where D as
2) A look for B look in C look after D look through
3) A in night B at night C for night D with noght
4) A was used B used C is used D are used
5) A made from B made of C make from D make of
6) A solid B the solid C the liquid D liquid
7) A whom B whoever C who D whose
8) A was from B formed C was formed D was forming
9) A between B among C beneath D both
10) A from B go C back D come
11) A was discovered B was invented C discovered D invented
12) A in B on C for D from
13) A knew B recognized C told D realized
14) A few B little C a few D a little
15) A from B to C into D on
16) A because B as C for D since
17) A instead B take place of C instead of D replace
18) A on B onto C into D in
19) A into B for C by D from
20) A smells B touches C sees D feels
答案:
1--5ADBCA
6--10 DCBAC
11--15 BADCA
16--20DCDCB
