1.Perhaps most interesting,and most easily measured,is a chemical change in ground water before a quake.2.It is also important to have something that can clean water and kill bacteria,so water from other sources can be made safe to drink.3.A sensible

来源:学生作业帮助网 编辑:作业帮 时间:2024/09/10 20:29:32
xUMsV+v!q'3YtUgK1 *x`c .! &8$ic' K$zdItL=s?Ht&  0MDCF 5vYtL5%&<ɔ3CAlR Ii634Ɠn҄IL(#gTI"4A"1LRVc1t (դʼnf*x4af$NLFjb:]&1XP16֯kT,.sOoć"6 2a0Ӎ$KE""2-QM)O*YM':QS֌ΐ &`@/(J:C쮇" 0=!eQU#1n*PT,*s6xRA JLiw䧙Ե) _շ(W|`&iDY4BW7&Dͳ(8TIEyO;ڐwIP)MOaȨ^R3w1REeJ3SXLd]>%LFv`>noA z26Kb #F\a=歍1vzk-tv}~2}^l۽m-J;c|}˶c[vNsx;bc^+o:=l6,:KKK`#Q[,͇3'_|s޽F&no e\p3}QK=~l?X+oC s9ŵ=^;j9,^/Uxsx.QVm E!x9+ ivnk?g|ȳ{L5ZNyuz.}D2їyʃYyj#4_2Yy /Bkלgi\+bAFWt2J\k[MTzSޔkܡvCY=,;X<ݚ}ꬷ5qr1nG|C? B 2{nV_Sۊo82o9j_+ :9D}uri;:Գ]-2,TG.=w0GvfAx {nMQtSnc۽ +3+:sįܽ4ev]^ %Rζc=t-$+:JX' =eϯA2VG澎(=y5QZMvI8h;^Ӌ/+gz| z