1. As pointed out at the beginning of the passage, people used to think that air pollution___ [A] caused widespread damage in the countryside2 X' y4 E8 I% T3 x8 h% K, h
[B] affected the entire eastern half of the United States- X" R" e( K' y! t
[C] had damaged effect on health. @% h* u" Y- [1 r! J/ v
[D] existed merely in urban and industries areas* ?! s' n) U; Q
2. As to the greenhouse effect, the author___% [" @+ L2 ?0 P% {- r6 w6 \+ X
[A] shares the same view with the scientists
9 W5 k- `& m7 j; B [B] is uncertain of its occurrence1 g, t" l/ j+ S$ ]) f0 e/ ]0 Z
[C] rejects it as being ungrounded$ U& C. |) @( N n
[D] thinks that it will destroy the world soon
% n1 l9 p) @7 C, J" w 3. The word "offset" in the second paragraph could be replaced by___4 M* c' h$ W8 l+ X# g6 l
[A] slip into6 }3 z( `: B R C
[B] make up for
; D9 r9 z3 m+ Y4 ? [C] set up! a+ T7 W3 X8 P- W8 }; o+ j
[D] cath up with
7 M1 j. g, [. m1 t 4. It can be concluded that___
' F& w# L+ L" j7 L; i# o [A] raising the world's temperature only a few degrees would not do much harm to life on earth
+ k# _2 a: h5 {. q: ?0 K" V [B] lowering the world's temperature merely a few degrees would lead many majoy4 a, O6 M: p! d% c1 }$ g; I) T
farming areas to disaster
& y% m" S# |: w& D [C] almost no temperature variations have occurred over the past decade
- N5 V; c$ [5 a, A9 o3 C [D] the world' s temperature will remain constant in the years to come* G! C/ q9 e0 ?- W8 b1 q
5. This passage is primarily about___: Y5 M, p% G+ v& J3 o5 M5 G% H
[A] the greenhouse effect
0 n* c4 D# h" j: j [B] the burning of fossil fuels
0 U7 a* L( u' i, c [C] the potential effect of air pollution$ w ~4 z, j& [5 f
: [: X# e% o) |% Y. q7 D [D] the likelihood of a new ice age |