A certain type of dinnerware made in Ganandia contains lead. t+ C7 K$ c c E
Lead can leach into acidic foods, and Ganandians tend to eat
$ P* s0 x; l- f( r4 ~highly acidic foods. However, the extreme rarity of lead poison-
6 ^' J( p/ q; r; X; a8 |ing in Ganandia indicates that the dinnerware does not contain
! H$ v; u, l1 |7 O3 m4 b( adangerous amounts of lead.
: _7 y: C0 a/ t/ T8 O" N Which of the following, if true, most seriously weakens the argu-
3 l; q8 m) S8 L% c1 i, d6 ~1 Wment above?+ T. Z6 t! ~" B$ Y" g( _- m* A3 C
The dinnerware is produced exclusively for sale outside
- [! P) A0 e" t, l: q Ganandia.
" {: l0 f2 \* G) N: N Ganandian foods typically are much more acidic than3 y- _% c$ g! ^. \8 A/ y5 n* o2 z9 I) t
foods anywhere else in the world.
& F( S, D: |- |5 Q' I( I0 [2 b( [# E* r The only source of lead poisoning in Ganandia is lead" }; _5 k) @! O2 m
that has leached into food. 1 N) u, t: v( n. O5 N4 O: ?; H
Most people who use the dinnerware are not aware that. d& ^& b- L3 A" \4 b3 {1 g
it contains lead. 6 W1 m; N- L0 X- H p! T) L0 P
Acidic foods can leach lead from dinnerware even if that
& s" |! n4 T. k% s3 S; |# C# h8 V dinnerware has a protective coating. 1 X7 |/ g7 U, c K3 E; K
答案 A |
发表于 2012-8-15 12:40:43
