sat 1.(A .Long been) isolated (B.from) the outside world and

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sat
1.
(A .Long been) isolated (B.from) the outside world and perched (C.high in) the Tibetan Himalayas,Lhasa is the capital of Tibet,(D.an autonomous region) of the People’s Republic of China.(E.No error)
正确答案是a.去掉been
但是.为什么这道题不要被动啊.＝＝不是被分离嘛,难道加了from就可以不要被动了吗?
2.(A meteorite shows) an enormous variation (b in size,from) micron-sized dust particles filtering (c slowly through )the atmosphere to giants( d weighing many) tons.( e No error)
变成meteorites show.为什么需要这样改?可以分析以下句子吗?
我选的是d.看着很别扭.

第一问中,前一句只是简单的陈述了西藏与世隔绝,没有被动语态,而且此处的 isolated 只是个形容词,而不是实义动词,用于陈述西藏与世隔绝在喜马拉雅山脉之上.不存在被动语态.
被动语态也分语境而用.这与加不加from没有关系.
第二句中,A处明显的错误,meteorite是可数名词.前半句翻译是：陨石在尺寸上展示出一个巨大的变化.这句话中如果用meteorite shows,意思就是众多的陨石秀,那么就违背了原句的意思了.当用 meteorites show,意思就是陨石表现出.!
为什么不选D,因为weighing many tons是个词组短语,意思是称重石、重石头.此处的weighing不是动词而是个名词,用于词组时,你可以理解成具有形容词性的名词.
不懂追问.

sat 1.(A .Long been) isolated (B.from) the outside world and (SAT)Long been isolated from the outside world 英语翻译A Novel Serine Metallokeratinase from a Newly Isolated B You're protected from the outside world 翻译you will keep yourself from the outside world and can be e 英语翻译i've been long,a long way from hereput on a poncho and p 1.They were almost completely cut off from the outside world 翻译We were quite out off from the outside world Happiness can come from the outside and from within i know()about the world outside.A.more B.less C.few D.little 1._______ has Hanmei been in the library?(原因) A.How long B.H How long has the shop__.A,been open.B been opened 答案是B为什么