請教pp-1-115

sugarhouse · 发表于 2004-10-10 23:33:00

115. Over one thousand mineral are known, most of which

are characterized by definite chemical composition,

crystalline structure, and physical properties.

答案為a,但請問structure不用加s嗎?這樣會不會不平行,因為查字典,此為可數名詞

wanghu · 发表于 2004-10-11 00:24:00

晶体结构，好像做结构讲时不可数

guandream · 发表于 2004-10-11 01:39:00

"mineral"=>minerals. "are known" determines a plural noun.

sugarhouse · 发表于 2004-10-11 13:28:00

非常感謝^^.....我真是太糊塗了

所属分类: TOEFL / IELTS