16 Nowadays many scientists depend on radiocarbon for dating age-old objects
, c: F$ v9 b# b( gA Right
4 w; h) Q7 G; t3 K; ?' {B Wrong
# V3 k5 B Q- _! UC Not mentioned
6 G+ k2 f) N7 s8 S0 x17 The radiocarbon dating technique is only about 40 years old$ g7 A$ o- i9 Q! l) v1 R4 o9 G
A Right / T3 F) e5 L4 m2 ?" A6 Y# Y
B Wrong
# F) w& t& S" D }: h: JC Not mentioned
- k* @( o% Y6 }1 m18 An atom of ordinary carbon has six protons and eight neutrons
" t7 h2 p5 g0 Q3 G2 Y0 ~A Right / B! y# m; \( Q; l8 n* [
B Wrong
& V4 V/ _8 y3 oC Not mentioned
0 q, n2 n+ ]$ Z" T5 X/ B19 Radar is used to determine the characteristics of radiocarbon
# q% O' z" {% P- @. `* l' IA Right
- z, h6 ?% u9 R3 y$ w* S uB Wrong
2 m4 l- J g% kC Not mentioned! V+ I/ D! @* y. U8 c7 c
20 Radiocarbon is reliable in dating an object back to at least 50,000 years% o% D; Z5 s" X& [2 `
A Right
. q+ m( @" j1 q9 P% aB Wrong 6 x; N% M- d% S
C Not mentioned |
发表于 2012-8-16 00:07:50
