It’s harder and harder to find peace and, especially, quiet.Even in the most remote parts of Alaska the sound of a jet crossing overhead is all too common.Scientists set off across the U.S.to study the audio ecology.They recorded more than a million hours of sound from various sources.
　　They found that noise pollution is not good for people and it’s even worse for animals with more sensitive ears.And the problem is not confined to land but echoes across the seas as well, where human-produced noise interferes with the live of various ocean dwellers.These days on Earth it’s rare to hear “silence”.

[单选题]H．ad you worked harder that time, you ______ a better position.A． could getB． have gotC． would getD． would have got

[单选题]The harder you study, __________ you will learn.A.much B.many C.the more D.

[单选题]The harder you study, ____ you will learn.A.muchB.manyC.the moreD.much more

[单选题]The harder Itried, _____ it seemed to solve that math problem.A.the impossi

[单选题]The harder Itried, _____it seemed to solve that math problem.A.the impossib

[单选题]Had he worked harder, he __________ 怎么选择H．adheworkedharder,he__________theexams.A．)musthavegotthroughB)wouldhavegotthroughC．)permittedarefreshmenD)arepermittedfreshmen

[单选题]Had he worked harder, he______the exams.A.must have got through B.would hav

[问答题]Beijing Olympic Games can make Chinese people work harder.

[单选题]Although we have achieved some success, we should work harder ______ now on

[单选题]The harder you study,()you will learn.你学习越努力，学到的东西越多。A.ThatB.ItC.the moreD.