Because I have no friends and ____ (亲戚) in London, I don't know whom I should turn to.
由溴乙烷制取乙二酸,依次发生反应的类型是( )
读课文《三峡》,默写
①表现群山高峻的句子是:____
②表现水流急速的句子是:____
③写出文中千古传诵的佳句:____