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D
As they migrate(迁移),butterflies and moths choose the winds they want to fly with,and they change their body positions if they start floating in the wrong direction.This new finding suggests that insects may employ some of the same methods that birds use for traveling long distances.Scientists have long thought that insects were simply at the mercy of the wind.
Fascinating as their skills of flight are,migrating behavior has been difficult to study in insects because many long distant trips happthousands of feet above ground.Only recently have scientists developed technologies that can detect such little creatures at such great heights.
To their surprise,though,the insects weren’t passive travelers on the winds.In autumn,for example,most light winds blew from the east,but the insects somehow sought out ones that carried them south and they positioned themselves to navigate directly to their wintering homes.
Even in the spring,when most winds flowed northward,the insects didn’t always go with the flow.If breezes weren’t blowing in the exact direction they wanted to go,the insects changed their body positions to compensate.Many migrating birds do the same thing.
The study also found,butterflies and moths actively flew within the air streams that pushed them along.By adding flight speeds to wind speeds,the scientists calculated that butterflies and moths can travel as fast as 100 kilometers an hour.The findings may have real-world applications.With climate warming,migrating insects are growing in number.Knowing how and when these pests move could help when farmers decide when to spray their crops.
71.What’s the main idea of the text?
A.Insects migrate with the seasons. B.Wind helps insects greatly in migrating.
C.Windsurfing insects have real direction.D.Scientists have trouble in observing insects.
72.Scientists originally thought that____________.
A.insects always waited for their favourable winds
B.insects chose the winds they wanted to ride
C.insects were just blown about by the wind
D.insects positioned themselves in the winds
73.It is not easy to stuay the migrating behavior of the insects because____________
A.the little creatures can fly very fast B.they have no regular migrating courses
C.the wind’s direction is hard to foresee D.their flight is long and high above ground
74.We can learn from the text that______________.
A.insects fly in the way birds do
B.insects travel more easily in autumn
C.insects never position themselves when flying low
D.insects rest a lot when the wind pushes them along
75.According to the passage,the findings can .
A.increase insects in number B.instruct farmers when to spray
C.prevent climate warming D.help protect insects
D
As they migrate(迁移),butterflies and moths choose the winds they want to fly with,and they change their body positions if they start floating in the wrong direction.This new finding suggests that insects may employ some of the same methods that birds use for traveling long distances.Scientists have long thought that insects were simply at the mercy of the wind.
Fascinating as their skills of flight are,migrating behavior has been difficult to study in insects because many long distant trips happthousands of feet above ground.Only recently have scientists developed technologies that can detect such little creatures at such great heights.
To their surprise,though,the insects weren’t passive travelers on the winds.In autumn,for example,most light winds blew from the east,but the insects somehow sought out ones that carried them south and they positioned themselves to navigate directly to their wintering homes.
Even in the spring,when most winds flowed northward,the insects didn’t always go with the flow.If breezes weren’t blowing in the exact direction they wanted to go,the insects changed their body positions to compensate.Many migrating birds do the same thing.
The study also found,butterflies and moths actively flew within the air streams that pushed them along.By adding flight speeds to wind speeds,the scientists calculated that butterflies and moths can travel as fast as 100 kilometers an hour.The findings may have real-world applications.With climate warming,migrating insects are growing in number.Knowing how and when these pests move could help when farmers decide when to spray their crops.
71.What’s the main idea of the text?
A.Insects migrate with the seasons. B.Wind helps insects greatly in migrating.
C.Windsurfing insects have real direction.D.Scientists have trouble in observing insects.
72.Scientists originally thought that____________.
A.insects always waited for their favourable winds
B.insects chose the winds they wanted to ride
C.insects were just blown about by the wind
D.insects positioned themselves in the winds
73.It is not easy to stuay the migrating behavior of the insects because____________
A.the little creatures can fly very fast B.they have no regular migrating courses
C.the wind’s direction is hard to foresee D.their flight is long and high above ground
74.We can learn from the text that______________.
A.insects fly in the way birds do
B.insects travel more easily in autumn
C.insects never position themselves when flying low
D.insects rest a lot when the wind pushes them along
75.According to the passage,the findings can .
A.increase insects in number B.instruct farmers when to spray
C.prevent climate warming D.help protect insects
查看习题详情和答案>>After winning a big game,athletes are often asked how they feel.Usually athletes say how 1 it is to win this big game.On the contrary,the fact is that losing a big game,or in my case,all the games,can be even harder.
From the spectators’ point of view,last year’s basketball 2 for my high school team was nothing 3 of an embarrassment.And 4 0 and 20 is certainly nothing to be proud of,that season had a bigger impact on me than any other.As a team captain,I knew it probably wouldn’t be the 5 year,but did I ever think we would lose every game?Of course not.Since six of our top players had graduated,it was clear that we were a (n) 6 team who would struggle.The struggle began earlier than expected, 7 ,as our team center was suspended (禁赛) for the season,and two key members decided to 8 for some reason.At this point,dropping out probably passed through every player’s mind,but in the end,we all stuck if out, 9 to work still harder.
Then there came a time when even our 10 and given up on us.Personally,I felt like it was 11 worthwhile giving my all.I thought,if even the coach doesn’t believe in us,why should I?But just as my hope began to 12 ,a teammate called a meeting.He said,“Nobody thinks we are going to win,but,as teammates and friends,we 13 it to each other to go all out every game.”
It was that moment that 14 me how to be a leader.It hit me that I certainly didn’t 15 the role.As a leader you can never quit 16 the team who looks up to you.It is one 17 to be named captain,feel great and go through the motions,but it is quite another to be a real captain and make sure everyone realizes their full 18 all the time.
I am sure it is great to go through without losing and bringing home awards.But in all honesty,I 19 the fact that my team lost every game last year.It may not help me to become a better basketball player,but it already has made me a better leader,and 20 .
1.A.exciting B.pleasant C.tough D.significant
2.A.game B.event C.league D.season
3.A.short B.full C.lacking D.sufficient
4.A.as B.while C.since D.now that
5.A.most interesting B.dullest C.most difficult D.easiest
6.A.unique B.adventurous C.young D.untrained
7.A.meanwhile B.though C.instead D.somehow
8.A.quit B.stay C.resign D.rest
9.A.hoping B.swearing C.claiming D.wishing
10.A.fans B.classmates C.sponsor D.coach
11.A.only too B.more than C.not a little D.no longer
12.A.fade B.gain C.destroy D.grow
13.A.owe B.think C.demand D.recommend
14.A.reminded B.told C.taught D.guided
15.A.act B.deserve C.play D.take
16.A.with B.alongside C.on D.for
17.A.matter B.aspect C.issue D.thing
18.A.potential B.goal C.enthusiasm D.confidence
19.A.hate B.treasure C.admit D.recognize
20.A.character B.captain C.person D.figure
查看习题详情和答案>>Richard Rice, a fast-talking man paced up and down in front of freshmen debate class, 1 us about his high expectations.We were special, he declared on our first day at Oak Park High School.But there would be no 2 to success.Only those who worked hard would shine.
Suddenly Mr. Rice 3 in mid-sentence and stared at me."You know," he said, "you're black!" Somehow, I knew he 4 trying to hurt me.
Mr. Rice was no 5 teacher.I entered high school not 6 quite sure what debate was.I left his class four years later as an outstanding debater.Even today, I'm not sure what 7 such a great teacher of him.He always said 8 he was thinking.And he was 9 .He'd 10 out of the classroom angrily if he thought a student was giving 11 his effort.The worst thing with us was to be taken no notice of. 12 , being torn apart by Mr. Rice in the middle of a practice debate meant you were one of his favorites.
He wasn't always 13 on us.I'll never forget the National Student Debate, at which my calm delivery and my firm grasp of the problems disappeared.The only face I could 14 in the audience was Mr. Rice's face.I could 15 I was doing terribly just by looking at him.After it was over, he came 16 to me."Not my best 17 , " I said.He shook his head, "No," Then , to my 18 , he gave me a hug.
Mr. Rice's style didn't make him a great teacher for everyone.Many kids 19 out of the debate class after the first year.But for me four years with him was my unforgettable 20 of a lifetime.
1.A.telling B.introducing C.announcing D.explaining
2.A.means B.methods C.shortcuts D.steps
3.A.rose B.paused C.shook D.turned
4.A.must be B.shouldn't be C.might be D.wasn't
5.A.average B.excellent C.special D.usual
6.A.always B.still C.even D.ever
7.A.turned B.made C.got D.became
8.A.however B.whenever C.whichever D.whatever
9.A.demanding B.careful C.easygoing D.gentle
10.A.steal B.march C.turn D.leave
11.A.no B.all C.less than D.more than
12.A.Anyhow B.Instead C.Therefore D.Besides
13.A.strict B.cruel C.impatient D.hard
14.A.figure out B.bring out C.look out D.make out
15.A.speak B.tell C.talk D.recognize
16.A.over B.across C.out D.upon
17.A.mariners B.argument C.performance D.behaviour
18.A.shock B.surprise C.regret D.disappointment
19.A.got B.turned C.ran D.dropped
20.A.experience B.chance C.course D.period
查看习题详情和答案>>After winning a big game,athletes are often asked how they feel.Usually athletes say how 1 it is to win this big game.On the contrary,the fact is that losing a big game,or in my case,all the games,can be even harder.
From the spectators’ point of view,last year’s basketball 2 for my high school team was nothing 3 of an embarrassment.And 4 0—20 is certainly nothing to be proud of,that season had a bigger impact on me than any other.As a team captain,I knew it probably wouldn’t be the 5 year,but did I ever think we would lose every game?Of course not.Since six of our top players had graduated,it was clear that we were a (n) 6 team who would struggle.The struggle began earlier than expected, 7 ,as our team center was suspended (禁赛) for the season,and two key members decided to 8 for some reason.At this point,dropping out probably passed through every player’s mind,but in the end,we all stuck it out, 9 to work still harder.
Then there came a time when even our 10 had given up on us.Personally,I felt like it was 11 worthwhile giving my all.I thought,if even the coach doesn’t believe in us,why should I?But just as my hope began to 12 ,a teammate called a meeting.He said,“Nobody thinks we are going to win,but,as teammates and friends,we 13 it to each other to go all out every game.”
It was that moment that 14 me how to be a leader.It hit me that I certainly didn’t 15 the role.As a leader you can never quit 16 the team who looks up to you.It is one 17 to be named captain,feel great and go through the motions,but it is quite another to be a real captain and make sure everyone realizes their full 18 all the time.
I am sure it is great to go through without losing and bringing home awards.But in all honesty,I 19 the fact that my team lost every game last year.It may not help me to become a better basketball player,but it already has made me a better leader,and 20 .
1.A.exciting B.pleasant C.tough D.significant
2.A.game B.event C.league D.season
3.A.short B.full C.lacking D.sufficient
4.A.as B.while C.since D.now that
5.A.most interesting B.dullest C.most difficult D.easiest
6.A.unique B.adventurous C.young D.untraining
7.A.meanwhile B.though C.instead D.somehow
8.A.quit B.stay C.resign D.rest
9.A.hoping B.swearing C.claiming D.wishing
10.A.fans B.classmates C.teachers D.coach
11.A.only too B.more than C.not a little D.no longer
12.A.fade B.gain C.destroy D.grow
13.A.owe B.think C.demand D.recommend
14.A.reminded B.told C.taught D.guided
15.A.act B.deserve C.make D.take
16.A.with B.alongside C.on D.for
17.A.matter B.aspect C.issue D.thing
18.A.potential B.goal C.enthusiasm D.confidence
19.A.hate B.treasure C.admit D.recognize
20.A.character B.captain C.person D.coach
查看习题详情和答案>>