Thus a proportion of the total volume of any sediment, loose or cemented, consists of empty space. Most crystalline rocks are much more solid; a common exception is basalt, a form of solidified volcanic lava, which is sometimes full of tiny bubbles that make it very porous.
Thus a (of the total volume of any sediment)proportion , loose or cemented, consists of empty space. Most crystalline rocks are much more solid; a common exception is basalt, a form of solidified volcanic lava, which is sometimes full of tiny bubbles that make it very porous.
因此这一个部分空空的空间所占据。大多数水晶石更为坚硬；一个例外是玄武岩，它是坚硬火山岩的一个部分，它有时充满气泡，这些气泡使它渗透性强。
非限定定语从句也可以代指宾语。
loose ：宽的
solidified ：坚硬的
Cemented：灌水泥的
Proportion:部分
Porous：渗透的
Basalt：玄武岩
crystalline ：水晶
Permeable：可渗透的
volcanic：火山
Lava： 熔岩
Sediment：沉淀物
According to paragraphs 6 and 7, why is basalt unlike most crystalline forms of rock?
为什么玄武岩不像大多数水晶组成？
A. It is unusually solid---错，不是solid，是porous。
B. It often has high porosity.
C. It has a low proportion of empty space.----错，是high proportion，不是low proportion。
D. It is highly permeable.---错，不是permeable高渗的，是porosity多孔的。