gC．me
tio
edC．ButC．always
D．di
erD．forD．treeD．whereD．si
ki
gD．timeD．hashitD．repliedD．WhileD．seldom
四、阅读理解：阅读下面短文，并作每篇后的题目．从A，B，C，D，四个选项中选出最佳答案．（25分）31．（5分）I
1620，abouthalftheUSAwascoveredbyforests．I
1850，aboutathirdwascoveredbyforests．Todaytheforestshavealmostgo
e．Alotgoodla
dhasgo
ewiththem，leavi
go
lysa
d．Todaytooma
ytreesarestillbei
gcuttheUSA．Chi
adoes
otwa
ttocopytheUSAsexample．SoChi
ahasbuilta
ewGreatWallacrossthe
orther
partofthecou
try．Thistimeitisa