When people want to know about the weather,they usually go to their radios,TVs, newspapers,or to the Internet.However,you can also find many weather signs among wildlife, because of their highly developed senses.Drops in air pressure(壓力) produce an effect on small animals in many ways.Mice and deer are good weather indicators.People who spend a lot of time outdoors have observed that,before a storm,field mice come out of their holes and run around.Deer leave high ground and come down from the mountains.
Birds are especially good weather indicators because they also show the effect of a pressure drop in many ways.For example,some birds become irritable(急躁的) and quarrelsome and will fight over a piece of bread.Other birds chirp(嘰嘰喳喳) and sing just before a storm.It seems they know they won’t get another chance for an hour or two.Birds also seek safe places before a storm.You will sometimes see birds settling in trees or gathering together on a wire close to a building.Pre-storm low pressure makes the air so thin that birds have difficulty flying.
It is unusual to see many birds flying overhead in the summertime,rather than during the periods in the spring or autumn.Watch for other weather signs if you see this.If they fly in the wrong direction,they may be flying ahead of a storm.
By paying closer attention to some important signs in nature,we can become better prepared for any kind of weather.
The word “indicators” in Paragraph 1 probably means ______.
A.maps B.services
C.signs D.stations
There will be a storm if birds ______.
A.make more noise than usual
B.fly in different directions
C.come down from tall trees
D.share a piece of bread
How can birds sense the coming of a storm?
A.By feeling a drop in air temperature.
B.By noticing the change of wind directions.
C.By feeling a drop in air pressure.
D.By noticing the movements of other animals.
The best title for the text would be ______.
A.Signs of a Storm
B.Drops in Air Pressure
C.Animals’ Sharp Senses
D.Nature’s Weather Signs
【小題1】C
【小題2】A
【小題3】C
【小題4】D
【小題1】這是一道詞義猜測(cè)題。根據(jù)第一段中的“People who spend a lot of time outdoors have observed that,before a storm,field mice come out of their holes and run around.Deer leave high ground and come down from the mountains.”可判斷出indicators的意思是“指示者;指示物”。
【小題2】這是一道細(xì)節(jié)題。根據(jù)第二段中的“...and sing just before a storm.”可判斷出當(dāng)暴風(fēng)雨來(lái)臨時(shí),鳥(niǎo)會(huì)發(fā)出比平常更加多的嘈雜聲。
【小題3】這是一道細(xì)節(jié)題。根據(jù)第二段中的“Pre-storm low pressure makes the air so thin that birds have difficulty flying.”可判斷出鳥(niǎo)通過(guò)感覺(jué)空氣氣壓下降而感覺(jué)到暴風(fēng)雨即將來(lái)臨。
【小題4】這是一道標(biāo)題選擇題。這篇短文講述了當(dāng)暴風(fēng)雨即將來(lái)臨時(shí)動(dòng)物的各種異常表現(xiàn),由此人們可以通過(guò)觀察這些異常表現(xiàn)而得出暴風(fēng)雨即將來(lái)臨的結(jié)論,所以這篇短文最好的題目是:Nature’s Weather Signs
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But when modern humans leave Africa to live in northern latitudes, they need more sunlight on their skin to produce vitamin D. So the related gene changes, according to Cheng.
Asians have the same version of the gene as Africans, so they probably acquired their light skin through the action of some other gene that affects skin colour, said Cheng.
The new discovery could lead to medical treatments for skin cancer. It also could lead to research into ways to change skin colour without damaging it like chemical treatment did on Michael Jackson.
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B. the new discovery could lead to search into ways to change skin colour safely
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A. find the different genes of humans’
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C. find out the reason why the Africans’ skin colour is dark
D. find out the ways of changing peopl’s skin colour
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A. they are born light-skinned people
B. light-skinned Europeans have mutation in the gen for melanosome production
C. they have fewer activities outside
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Can people change their skin colour without suffering like pop king Michael Jackson? Perhaps yes. Scientists have found the gene that determines skin colour.
The gene comes in two versions, one of which is found in 99 per cent of Europeans. The other is found in 93 to 100 per cent of Africans, researchers at Pennsylvania State University report in the latest issue of Science.
Scientists have changed the colour of a dark-striped zebrafish to uniform gold by inserting a version of the pigment(色素) gene into a young fish. As with humans, zebrafish skin colour is determined by pigment cells, which contain melanosomes(黑色素). The number, size and darkness of melanosomes per pigment cell determines skin colour.
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However, Keith Cheng, leader of the research team, points out that the mutation is dif ferent in human and zebrafish genes.
Humans acquired dark skin in Africa about 1.5 million years ago to protect bodies from ultra-violet rays of the sun(太陽(yáng)光紫外線), which can cause skin cancer.
But when modern humans leave Africa to live in northern latitudes, they need more sunlight on their skin to produce vit amin D. So the related gene changes, according to Cheng.
Asians have the same version of the gene as Africans, so they pr obably acquired their light skin through the action of some other gene that affects skin colour, said Cheng.
The new discovery could lead to medical treatments for skin cancer. It also could lead to research into ways to change skin colour without damaging it like chemical treatment did on Michael Jackson.
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A. people can not change their skin colour without any pain
B. the new discovery could lead to search into ways to change skin colour safely
C. pop king Michael Jackson often changed his skin colour as he liked
D. scientists have found out that people’s skin colour is determined by the gene
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A. find the different genes of humans’
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C. find out the reason why the Africans’ skin colour is dark
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A. they are born light-skinned people
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C. they have fewer activities outside
D. they pay much attention to protecting their skin
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