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

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 f．oresee　

　 D．their flight is long and high above ground

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 j ust blown about by the wind

　 D．insects posi tioned themselves in the winds　

71．Whatl 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．

70．It can be concluded that　　　　　　

　 A．eating disorder always goes hand in hand with being slim

　 B．girls are more concerned about body shapes than boys

　 C．daughters tend to have a lifelong struggle with weight

　 D．the author is against children’s dieting

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　 happen thousands thousands of feet above ground． Only recently i have scientists developed technologies that can detect such little creatures at such great heights．

To their surpri se，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 wIntenng 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．

69．The passage tells US that　　　　　　　 ．

　 A．mothers’lead is of great importance

　 B．daughters are victims of mothers’authority

　 C．dieting teenagers can't turn into obese adults

D.experts have arguements about eating disorder

68．According to Ringwood，　　　　　 ．

　 A．food is considered something fearful

　 B．food can be recognized as“good”or“bad”

　 C．only slim mothers are role models of their daughters

　 D．eating di sorder has something to do with genetic component

67．The author mentions Carly in Paragraph 3 to show that　　　　　　　　 ．

　 A．mothers have a great influence on girls，eating habits

　 B．the more you diet，the more weight you will put on

　 C．mothers are to blame for the unbalanced diet

　 D．side effects of dieting are hard to avoid

66．Michelle Obama has started a campaign to　　　　　　　　　 ．

　 A．solve childhood obesi ty across the country

　 B．attract the attention of the world

　 C．show her first lady identity

　 D．please the public

65．What is probably talked about following the last paragraph?

　 A．Conventional dating．　　 B．Hidden advantages．

　 C．Safety measures．D．Romantic love．

C

　　 Michelle Obama has just started a campaign

　against childhood obesity(肥胖)with the admission that she put her girls Malia and Sasha on a diet because they were getting fat．Clearly，childhood obesity must be solved and urgently．But is it a good idea for mothers to put their daughters on diets?

Studies show山at the more children diet，the more likely they are to become obese asad ults．Research also shows that gifts are highly influenced by their mothers when it comes toeating habits and body image．

This was the case for Carly，40，who blames her mother for her lifelong struggle with weight．“My mother was on a diet the whole time 1 was growing up，”she says．“And she putme on my first diet when 1 was 10．I lost puppy fat，gained her approval and never ate normally　 again，　 America’s First Lady clearly has a vital healthy eating message to．convey．But could this be damaging for Malia and Sasha?Could they develop eating disorders because of it?

　“It’s wrong just to blame mothers for their daughters’eating disorders，”says Susan Ringwood，chief executive of the eating disorders charity，Beat．“There is a genetic(基因的)component to eating disorders．"However，“We do know that parents have a very strong influ。ence over a child’s eating．It's important to realize that you are your daughter’s role model．Girls idolize the ir mothers．”says Ringwood．

　“Nofoodshould ever be‘good'or‘bad’，”Ringwood says．Instead，“You have to make it clear that food is a sociable，healthy and fun part of life，not something to be feared．”

　“Talk to her about body image，”Ringwood says．“Talk about how curves are an important and exciting part of being a woman．Show her that anorexic(厌食的)fashion models are not sexy，but i11．The pressure on girls today is immense，”she says．“But don’t forget that you are the authoritative voice，too．”