西部大开发要加强生态环境保护和建设,( )长江上游、黄河上中游区内的天然林。
A.停止采伐并严加管护
B.减少采伐并严加管护
C.控制采伐数量
D.从分利用
参考答案:A
用所给单词的适当形式填空。
1.I can do it _________ (easy).
2.I exercise fifty _________ (minute) every morning.
3. _________ (do) exercise is good for our health.
4.Eating more vegetables can make us _________ (health).
5.She _________ (clean) the room before she went out.
激光荧光法和TBP萃取荧光法测定空气中微量铀时,除非另有说明,分析时均使用符合国家标准或专业标准的()纯试剂。所用水均为()水或()水。