北京鼎钧 3.11 11:00
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issue: To be an effective leader, one must maintain the highest ethic and moral standards.
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& Q& e4 b5 E- z* _# u$ m6 E* targue:207.It is known that in recent years, industrial pollution has caused the $ E( P" J' P# m
Earth's ozone layer to thin, allowing an increase in the amount of
1 R( M- T0 t8 Hultraviolet radiation that reaches the Earth's surface. At the same time, 6 u4 F( K& ?- B
scientists have discovered, the population of a species of salamander that ! \, g; _' ]! b6 i. C; a8 C
lays its eggs in mountain lakes has declined. Since ultraviolet radiation & e. H: U" x# {9 \/ T# b* ^
is known to be damaging to delicate tissues and since salamander eggs have * Q3 ?# ]/ V l* h
no protective shells, it must be the case that the increase in ultraviolet
' b$ y& l/ D3 k6 Uradiation has damaged many salamander eggs and prevented them from ( x( i+ Z9 h7 d& c Y
hatching. This process will no doubt cause population declines in other - d* v+ k- z$ _/ Y, b
species, just as it has in the salamander species. 6 Z- @$ L9 x+ E/ c3 K: |
6 q7 x5 {2 I% o0 G" m4 J6 c9 \感受 issue 写的很不好 没平时冷静5 V" B) t1 H, P' J% a( G4 u
大家要加油