1.According to the infromation,the newly-constructed highway is said to be_______.
A.length twenty miles.
B.length about twenty miles
C.about twenty miles long
D.in twenty miles of length
15.The life of a sunfish is short,____ten years.
A.more seldom than
B.more than seldom
C.seldom more than
D.seldom than more
19.X rays are able to pass through objects and thus make _____details that are otherwise impossible to observe.
A.it visible
B.visibly
C.visible
D.they are visible. | 
