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λ~ʲôӵ?
λ~w׃Ժͼ(ji)
׃ԣλ~ÁλԱЩԭȻ׃~RxͨÄ~~λͨ~䮔(dng)Z~
(ji)ԣҪҴ~RҪôȫּ~RλQԒfҪЩԭһѵ~Roλ
95ӢίTBritish CounciloΨһ}µ}Ŀ:The Spectacular Eruption of Mount St.Helens
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@}ҰMount St.Helens P(gun)I~ԭMжλȫҪvľʥ˹ɽćl(f)ԭNMount St.HelensԼʹ@~ڴČ~`˼(ji)ǸԵ~RҲ鶨λ~팤Ҵ
Щ~x(dng)г䮔(dng)λ~?
Ƕλ~ķ
1.~R
xһЩ~ı^⣬@N~ױӛסҲԭĶλ
ñڴϿһ˹ܲ-------y
һ˵ĂӳߣҦһ------L
һϴ10Nɫ·Ҳͣēu^-----
Ly
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Sequoia ɼ ---ܺöλҲ(jng)鿼c
sodium W(xu)c---yֻҪ֪һNW(xu)Ԫӡ
Simultaneous ͬr---L@N~cQ(yng)鶨λ~
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“What are the dates of the TWO major eruptions before 1980?”
ô1980 3185$ 69%@Щ~LԭȫӢͻȻׂܳ(sh)ʮ@Ҳͺܺûԭҵ
3.~бw,Č~@һcҶϤöf
4.̖
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֮ڇԇxoՓx߀ǻش10}Ŀλ~ČһNЧđ(yng)ԇnjW(xu)g(sh)µxҪ