31 On a clear night．people can see% W* ^9 o1 {, ?
A 150 stars" N7 s/ n# p0 A7 H( l% W3 u
B hundreds of stars4 h% ?+ K* w& V3 u2 z
C one thousand stars0 t7 {: i; e0 e0 l
D more than 14,000 stars
6 y# ?/ G) y% r$ D5 V32 Light pollution occurs when
6 W7 i! w. u3 c* RA artificial lights illuminate the night sky$ l# l; u5 ]8 _# U2 ^, O3 B1 }
B the moon lights up the night sky7 O$ d9 n, X m
C too many stars are visible in the night sky．$ ?0 O5 R B% \) c% v
D streetlights are turned off8 Z2 `9 m1 `4 j/ W# a6 K
33 Nowadays even suburbs are becoming unsuitable for scientists to do their jobs! _) h- y3 c3 b5 p, `
because
# V! h9 y. k8 X3 w" hA the night sky there is too dark- o9 U7 R6 B2 } o( B
B the once dark areas are also polluted by fights．
8 }# P4 u( x7 Y. }. h+ ]C these areas are not polluted by chemicals
7 y2 _$ s) o; s" ~D these areas are less developed
9 h! ^1 L/ S' N8 v, c/ u34 How does light pollution affect wildlife?
8 U6 y8 u- j& F5 T% T& T: YA Animals may go off course: n# j9 T7 a) K! E
B It helps migrating birds find their homes
: ^! \+ q2 _6 l6 \9 L. ~C Animals are afraid to go out after sunset
; |% i8 W0 ?4 N1 t" gD It helps birds fall asleep. W" E; z/ |! u6 [1 m( v# d
35 The title“Light Night，Dark Stars”means! C7 _' L! F1 ~/ d
A the night sky is brightly lit up and stars are black# K4 F) } x( U. S, T& J
B lights appear at night and stars are seen in the dark
( U ~' d3 V u; C9 Y: zC city lights at night illuminate stars in the sky
' @" K! r% [* K$ g( J$ xD city lights illuminate the night sky．making stars invisible |
发表于 2012-8-16 00:07:50
