填空题 To summarise,countries should make a()effort not only because the()is a()()but also because it can make()use of()and()()

填空题 It is()()that we share the same(),whose()are()

填空题 （）（）has been recognized as one of（）（）（）that we have to（）in the 21st century

填空题 To（）this（）,countries（）should（）（）,instead of（）（）for their own （）

填空题 It should be()that some countries do not have()resources including()and()to reduce pollution,()()these countries realise the importance of environmental protection

填空题 The repaid（）of environmental problems（）（）（）（）（）a serious threat to our survival

填空题 ()()(), one country’effort to()()can be ()if other ountries are not()

填空题 For example,a()in one country can be polluted by the()() by its()()

填空题 People support international cooperation for two reasons and the first（）is that the（）of environmental problems is（）（）（）（）（）