When cut, the synthetic material fiberglass, like asbestos,
8 U2 g2 K; O7 u3 n8 |* K9 _releases microscopic fibers into the air. It is known that people$ d8 G1 x" B& }5 ]2 y" p
who inhale asbestos fibers suffer impairment of lung function. ' a% } \. R l" J
A study of 300 factory workers who regularly cut fiberglass
3 W- ~' F2 M7 Q' u1 q/ m; Vshowed that their lung capacity is, on average, only 90 percent 3 H( F% [4 I9 ^# A. b
of that of a comparable group of people who do not cut fiber-0 J" A! u6 c$ U# J& B
glass.
! v# D) e8 A2 m$ g( iThese statements most strongly support which of the following 6 m- ^ R7 P4 `1 T
hypotheses? ' i3 P' ?: i: U* \' a( N
People who work with fiberglass are likely also to work with
$ r4 ]% Q% z( `6 c0 y asbestos.
% N7 J1 N. @1 y; J" M9 ? Fiberglass fibers impair lung function in people who inhale
( q8 B$ G" P. t* x$ c them.
+ H+ e: Y ?4 C. F$ } Fiberglass releases as many fibers into the air when cut as
1 s0 d* Z* F0 P0 }! C* S, z does asbestos. : M' k2 t5 x2 |: `% T
Coarse fibers do not impair lung function in people who $ H" ^* r* p; B) g1 m9 c
inhale them. 0 w! d4 ? A X
If uncut, fiberglass poses no health risk to people who 9 _5 {2 v6 R+ _2 h7 j8 z6 i9 d3 T
work with it. 4 e) }! S" Y: ?8 C* I5 _9 B
答案B |
发表于 2012-8-15 12:40:43
