today the forests are getting fewer and fewer .we must ( )down too many trees.

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• 1.Today the forests have almost gone.People must (be stopped from cutting) down too many trees.括号中为什么不能填be stopped to cut?2.You'd better give up smoking,(or) you will get ill.括号中为什么不能用and?3.-Linda,I am very thirsty.-Let's go to the nearest supermarket (to buy) some drink,OK?为什么括号中要用不定式?用buy不行吗?
• ①Who jumps highest in your class?—john ____.A.has done B.did C.does D.do我认为是选B 可答案是选C、 可跳高不已经是过去式了吗?②Today the forests have almost gone.People must____down too many tress .A.stop on cutB.stop from cuttingC.be stop to cut D.be stop from cuttingC③We must do everything we can ____ waste water from running intorivers.A.keep B.kept C.to keep D.keeping can 不是情态动词吗?后面难道不是接原型吗?④ She counldn't __ her words ___by the students.A.get understand B.get understood C
• 1.Today the forests are getting fewer and fewer.We must( )down too many trees.A.keep people from cuttingB.prevent people from cuttingC.stop people cuttingD.all the above2.We found( )to sleep.A.that difficult to getB.it difficult gettingC.it is difficult to getD.it difficult to get
• 1.Today the forests have almost gone.People must (be stopped from cutting) down too many trees.括号中为什么不能填be stopped to cu
• 1.Today the forests are getting fewer and fewer.We must( )down too many trees.
• today the forests are getting fewer and fewer .we must ( )down too many trees.
• 1.Today,the forests have almost gone.People must___ down too many trees.
• today the forests have almost gone .people must --- down too many trees.选项在下面
• today the forests are getting fewer and fewer .we must ( )down too many trees.A keep people cuttingB prevent people from cuttingC stop people cutting
• today the forests have almost gone .people must --- down too many trees.选项在下面A stop from cuttingB stop cutting
• 周期函数的判断
• 若集合A=(x|x^2+2x+a=0)不等于空集,a属于R,则A中所有元素之和为?