练习三
1.For most of us in America,modern technology is as the reason why we can have cars and television sets.
A.supposed B.thought of C.accept D.known
2.New machines and new methods have helped time and expense while increasing output(产量).
A.cut down B.add to C.exploit D.improve
3. ,technology has also increased the amount of food available (可利用的)to us,by means of modern farming machinery and animal feeding techniques,and has extended our life span(寿命)through medical technology.
A.Therefore B.Besides C.However D.Otherwise
4.Technology is the use of knowledge to increase production. modern technology,we have been able to increase GREatly the efficiency (效率)of our workforce.
A.Since B.Like C.As D.Thanks to
5.This has more production and a higher standard of living.
A.show B.meant C.suggest D.produced
练习四
1.Scientists have given much time and to the study of insects.It needs the most careful and patient observation.Thanks to their discoveries we now know almost all there is to be known about the habits of these hardworking insects,bees and ants,which live in societies better planned in some ways than our own.
A.understanding B.ideas C.views D.thought
2.Other varieties, ,are very harmful,and do a GREat amount of damage,especially to crops.Locusts are perhaps the most dangerous of all,for they eat almost any green plant.
A.however B.meanwhile C.therefore D.otherwise
3.But the most valuable work has been done in trying to give to men,animals and crops from the injury which insects cause.
A.assistance B.protection C.help D.defense
4.Of all living things on earth,insects are the most plentiful.Some are very useful to man,for example,bees,from which we get honey,and silkworms,which supply us with silk.
A.members B.forms C.qualities D.varieties
5.In some countries they are the farmers GREatest enemy.Another nuisance is the common fly,not only because it us indoors and out of doors,but because it spreads disease.
A.eats B.bites C.annoys D.hates
Key:
练习三:1.B 2.A 3.C 4.D 5.B
练习四:1.D 2.A 3.B 4.D 5.C
