31 On a clear night．people can see
$ m% ~( s! |. {% c nA 150 stars+ K- L( \6 \% x: v5 S: W" B3 R4 [
B hundreds of stars# T N, S( Q5 C- R' z/ h
C one thousand stars
R+ t0 [9 e0 ID more than 14,000 stars
* s6 s- V2 C3 i& j6 X& s, X32 Light pollution occurs when& w& U6 _! b/ n
A artificial lights illuminate the night sky) o) a! K, p0 y7 n% h- o, a
B the moon lights up the night sky% U$ G/ u$ r$ Q, X
C too many stars are visible in the night sky．
2 b% _3 w9 G( \8 OD streetlights are turned off
1 E3 v$ I! t8 E% k5 e2 O0 B' n8 d' y33 Nowadays even suburbs are becoming unsuitable for scientists to do their jobs
( W- n5 A# ~ I/ [% ^- t9 b" tbecause
9 a" R9 A- H5 X NA the night sky there is too dark
, `3 y# l! b5 B: q$ a2 y' S! sB the once dark areas are also polluted by fights．/ Y0 H" b$ F' F. P
C these areas are not polluted by chemicals( a; G/ Y3 G/ G- w! ]
D these areas are less developed! t) M4 l$ j4 Q
34 How does light pollution affect wildlife?+ J& U) m1 U: C; A9 L5 O p7 j; [
A Animals may go off course
, X4 P3 T1 N8 M- q2 SB It helps migrating birds find their homes z$ w* L% B) P% @1 q/ E$ I
C Animals are afraid to go out after sunset# M7 a( k P) |8 Q- C
D It helps birds fall asleep
" P( d2 r" y2 C: s3 j35 The title“Light Night，Dark Stars”means+ |9 Z/ S# t+ b% ~+ x( o( Y
A the night sky is brightly lit up and stars are black
' a( y; f5 h3 o7 b' U0 v, c) ?1 hB lights appear at night and stars are seen in the dark
- ^$ `$ V1 E; R! U5 b$ L; ^% gC city lights at night illuminate stars in the sky
& j3 S+ ]' b# r7 e1 H+ `5 ?0 CD city lights illuminate the night sky．making stars invisible |
发表于 2012-8-16 00:07:50
