Please explain some questions in 10/2003

[CBS]

(10)Helium is not flammable and ,next to hydrogen ,is......

 

(a)known the lightest gas

 

(b)lightest the known gas

 

©the lightest gas known

 

(d)the known gas lightest

14.Cells,first identified by the early microscopists, began to be considered......in the nineteenth century.

 

(a)them as microcosm of living organisms

 

(b)the microcosm of living organisms

 

©the microcosm of living organisms to be

 

(d)as which ,the microcosm of living organisms

 

 

 

21.The Pacific Ocean comprises almost the entire boundary western of North and South America.

29.Today ,fifty years after its construction ,the Alaska Highway conveys 40,000 vehicles in normal year.

 

 

30.Since prehistoric times ,artists (have been) arranged colors on surfaces (in ways) (that express) their ideas (about people) ,the world ,and religion.

 

 

34.European settlersin North America moved from the Atlantic coast across 3,000 miles forests, grasslands, deserts, and mountains untilthey reached the Pacific Ocean.

 

 

38.Twenty thousand years ago a sheet of ice a thousand meters thick covered the coastal region which the cities of Vancouver and Juneau now are located.

[manasi4gre]

my ans are :

10.c

14.b

21.d should be western boundary

29.d should be in a normal year

30.a should be have arranged

34.c should be miles of forests,grasslands...

38.c which should be where

[CBS]

Thank you very much manasi4gre :)

 

Can you explain #10 ?

[manasi4gre]

helium fits the tag of being the lightest known gas next to hydrogen i.e after hydrogen that comes first,even though it is inflammable.Hope its clear.U can see for urself,none of the other choices make any sense.