Comparison of the growth rings of ancient trees enables scientists
0 \4 S+ W' @6 ~. F2 R# u, a* ^to determine from a piece of timber the year in which the tree used2 R1 M; d4 S8 B- d
for the timber was felled. Hence, by analyzing the growth rings in 6 F9 I* x" f, U9 g
timber surviving from ancient buildings, archaeologists can deter-2 Q, G, ^) ]) O r6 g0 N D# z p M5 q
mine precisely when those buildings were constructed.* l7 t) N _0 Q# A0 u+ ?
Which of the following is an assumption on which the argument
! F$ d6 H, j: M: K; cdepends?
' j$ i. ]+ c" Y. Z The timber used for construction purposes in ancient times5 R6 D; D' X8 c4 @% _5 w
was made from very old trees. # C8 v' P& c) I* q% _3 T# b+ U
The timber that was used in ancient building construction had" q' x$ h% y* {; q/ e1 X4 }8 s. ^
not, prior to being used in the construction of the buildings,
& c9 o' u4 U5 l! X# t7 H lain unused for an indeterminable amount of time. 4 w. f4 T& B, B' [
The growth rings of any tree felled in a given year are iden-
3 T& b( y9 B: V tical to the growth rings of any other tree felled in that year.
4 L' y: U% r, x V$ w The oldest of the ancient buildings that survive to the present
* O, f+ K3 l; B% }1 ] day were constructed of the most durable woods. S( C( k) z; o* l7 m8 s
Ancient builders did not use more than one type of wood for
/ X; o4 `4 ]$ @1 g" A8 d9 Z the construction of a given building. : r3 w& ?; }, x
答案:A |