Zhangye has set up Qilian Mountain Nature Reserve，______ animals and plants can be protected well．
A.from which B.why C.when D.where
"Not all birds can fly"means ．
A.All birds can not fly B.No birds can fly
C.None of birds can fly D.All birds can fly
The scientists showed great ______ the warming of the earth．
A.interest in B.love for
C.concern about D.attention for
More strict measures to protect Heihe River Basin in a few years．
A.have been taken B.will be taken
C.were taken D.had taken
﹣﹣Why not go into the classroom？
﹣﹣The door locked．
A.have been B.will be C.has been D.is
If you've ______ those things that seem impossible，you will succeed finally．
A.gone through B.gone over C.gone by D.gone back
