Where Do Mosquitoes(蚊子)Go in Winter?
Why do mosquitoes ,everywhere in warmer months,disappear completely in winter?1.Mosquitoes are cold-blooded insects, meaning that they don’t like the cold and prefer temperatures that are 80 degrees .Fahrenheit or more. When the temperature drops, they actually lose their ability to fly and become motionless.
2.They would never be able to fly far enough. The actual answer to the question is different for male and female mosquitoes. Male mosquitoes? They die. But that’s not just because of the cold. Male mosquitoes have far shorter lifespans(寿命) than females, and they die in autumn.
Female mosquitoes, though, can live through the winter. They hibernate (冬眠). In autumn, the females will go into hollow logs or cracks in the ground and enter this still state.3.They put off their development, typically for months.
When it warms up again, the females will come out from hibernation. At this point, they’re getting ready to lay their eggs and they need as much blood as possible to help the eggs develop. The females must find a blood meal to provide the protein(蛋白质) needed by their eggs to develop, just in the time, when humans are outdoors in short sleeves enjoying the warming weather.4.
It actually doesn’t have to be what we humans would consider “cold” to put a mosquito in danger. While these pests live actively when it’s around 80 degrees F, most species can start heading into hibernation when it drops to around 50.5.This is when female mosquitoes start looking for a place for sleep.
A.The obvious answer is that it’s cold.
B.Now it’s time for male mosquitoes to wake up.
C.It’s only the female mosquitoes that are biting you.
D.Unlike birds,mosquitoes don’t fly south for the winter.
E.Anything below 50 degrees is already too cold for most mosquitoes.
F.They carry on with life only when there is enough water for their needs.
G.They can hibernate for up to six months in freezing or waterless conditions.
高一英语七选五中等难度题
— How often do you take a bath in winter?
— ______.
A．Every two day B．Every other day
C．Each other day D．Twice week
高一英语单项填空中等难度题查看答案及解析
Where do the turtles go?
Every summer, thousands of endangered green sea turtles climb onto beaches around the world. Each mother sea turtle produces 100 or more eggs in a hole, and covers the hole with sand before she swims away.
Two months later, the eggs hatch(孵化), and the baby turtles climb out of the sand and swim into the ocean. They don’t reappear until they have grown as large as dinner plates. Until now, no one knows where the baby turtles go or what they do.
“if we don’t know where these little turtles are, we can’t protect them,” says Kim Reich, who helps solve part of the mystery.
Her teacher, Karen Bjorndal, has studied green sea turtles for more than 30 years. Every year, Bjorndal goes to the Bahamas Islands. Many young sea turtles come here to live and eat at the end of their childhood.
These turtles are the only sea turtles that live as plant eaters. In fact, their name may be a result of what they eat. The turtles don’t look green but they do have green fat. Scientists learned that the turtles eat green sea plants, which may turn their fat green.
Between 2002 and 2004, Bjorndal caught 44 green sea turtles in the Bahamas. After testing them, she found something to support the 20-year-old idea: baby green sea turtles eat meat before they turn to a diet of plants. In fact, they eat animals that live in the open ocean.
Scientists still need to find where exactly green sea turtles grow. We now know that baby green sea turtles are out in the open ocean, but the open ocean is a big place.
“It is really a problem,” says Bjorndal. The discovery may help us do a better job of protecting this sea animal.
1.What can we learn from the first two paragraphs?
A. baby turtles go to the ocean when they are two months old.
B. Mother turtles leave the eggs alone after they produce them.
C. No one knows when turtles appear on the beach.
D. Mother turtles are as large as dinner plates.
2.Kim Reich does research on where baby turtles go because she wants to _________.
A. help her teacher B. prove an idea
C. protect turtles D. become a scientist
3.What does Karen Bjorndal’s research prove about green sea turtles?
A. the young live in the Bahamas Islands.
B. The young eat meat before turning to a diet of plants
C. They live in the open ocean for a lifelong time
D. They are the only sea turtles that live as plant eaters.
4.What does the underlined word “It” in the last paragraph refer to?
A. Finding out where young turtles grow.
B. Protecting this endangered sea animal.
C. Changing young turtles’ eating habits.
D. Living in the open ocean.
高一英语阅读理解中等难度题查看答案及解析
I’m protecting myself ________ mosquitoes.
A. from B. in C. on D. at
高一英语单项填空中等难度题查看答案及解析
听下面一段较长对话，回答以下小题。
1.Where is the woman’s company?
A. In Japan. B. In Britain. C. In Australia.
2.Why does the man talk to the woman?
A. To look for a travel agent. B. To ask about a tour. C. To seek cooperation.
3.What are the speakers going to do next?
A. Do the market research. B. Go to a restaurant. C. Have a discussion.
高一英语长对话中等难度题查看答案及解析
I was raised in New York City where it’s very cold every winter. In the sixth grade, a teacher offered 1.(bring) some students to a homeless shelter after school. I went with my friends and the teacher for several weeks.2., I continued to volunteer to help when they stopped going together. Because I was good 3.sewing, I was told to help out with the sewing kit when any guests needed some repairs. Throughout high school I continued to come each week after school, setting up my sewing kit which4.(grow) larger and larger. I got to know the guests who came 5.(regular).
Later on, I started 6.sewing club with my friend and we taught 7.(we) fellow students how to sew. We made heart-shaped pillows for sick 8.(child) and the elderly. Every time it rained I would think about the umbrellas 9.(design) before. In the future I hope to continue helping others as much as I can. It is the most important thing I10.(do) ever since.
高一英语短文填空中等难度题查看答案及解析
We know the mosquito very well. Mosquitoes fly everywhere. They can be found almost all over the world, and there are more than 2,500 kinds of them.
No one likes the mosquito. But the mosquito may decide that she loves you. She? Yes, she. It’s true that male mosquito doesn’t bite(咬) and only the female mosquito bites because she needs blood to lay eggs. She is always looking for things or people she wants to bite. If she likes what she finds, she bites. But if she doesn’t like your blood, she will turn to someone else for more delicious blood. Next time a mosquito bites you, just remember you are chosen. You’re different from the others!
If the mosquito likes you, she lands on your body without letting you know. She bites you so quickly and quietly that you may not feel anything different. After she bites, you will have an itch(痒) on your body because she puts something from her mouth together with your blood. By the time the itching begins, and she has flown away.
And then what happens? Well, after her delicious dinner, the mosquito feels tired. She just wants to find a place to have a good rest. There, on a leaf or a wall, she begins to lay eggs, hundreds of eggs.
1.We know mosquitoes very well because ________.
A. they can be found easily
B. they fly here and there
C. there are many kinds of them
D. they can fly
2.If the mosquito doesn’t bite you, it will ________.
A. get angry with you
B. be afraid of you
C. make a lot of noise
D. choose another one
3.The mosquito bites you ________.
A. when you’re asleep
B. because you have chosen it
C. too quickly to let you know
D. but doesn’t like you
4.Which of the following sentences is wrong?
A. The itching begins after the mosquito bites you.
B. You feel terrible when the mosquito bites you.
C. Mosquitoes use blood to lay eggs.
D. All the mosquitoes don’t like to bite people for blood.
高一英语阅读理解中等难度题查看答案及解析
Japanese researchers are genetically changing mosquitoes so that they become carriers of a vaccine (疫苗) that could vaccinate millions for free. The researchers have already genetically changed a mosquito species so that its saliva (唾液) contains a protein that acts as a vaccine against leishmaniasis(利什曼病）, a deadly disease that leads to terrible skin problems. The team confirmed that mice bitten by the genetically-engineered mosquito developed an antibody to the disease, meaning they had built up immunity (免疫力).
“You would be vaccinated without even noticing. You wouldn’t need any drug and you wouldn’t need to show up at a fixed place for mass vaccinations,” said Shigeto Yoshida, the associate professor who has led the research. “Repeated bites would only strengthen the immunity.”
Similarly the mosquitoes could be used to help treat malaria (疟疾), perhaps a decade from now, said the malaria expert.
Nearly one million people die each year from malaria ---- most of them are children ---- mainly in Africa and Asia, according to the World Health Organization. Now a problem is that no effective vaccine exists. “There is a treatment that works, but it is beyond the reach of people who need to worry about food for tomorrow,” Yoshida said.
However, Yoshida expects that the genetically-engineered mosquito will finally help wipe out the deadly disease in the developing world. “Technically speaking, I believe it’s a matter of 10 years or so, but it’s not clear whether society would accept it,” he said.
Another problem is that the genetically-engineered mosquito may still pick up and spread the infected blood of a person who has already caught malaria. Yoshida’s team is hoping it can solve this problem by developing a mosquito species that kills the malaria virus inside its own body.
1.How have scientists turned mosquitoes into carriers of a vaccine?
A. By changing their genes. B. By killing the virus in their bodies.
C. By letting them bite mice. D. By injecting vaccines into their bodies.
2.Which of the following is NOT an advantage of using mosquitoes as vaccine carriers?
A. It’s free of charge. B. It’s convenient.
C. It’s more effective. D. It’s unnoticeable.
3.What can we infer from the last two paragraphs?
A. People welcome the idea of using mosquitoes to treat malaria.
B. Mosquitoes carrying vaccines may still spread malaria.
C. It is not long before people will use mosquitoes to get rid of malaria.
D. A mosquito can kill the malaria virus inside its own body.
4.The main purpose of the passage is to .
A. introduce a possible solution to malaria
B. encourage people to use mosquitoes to fight against diseases
C. show that Japan has very advanced technology
D. call on people to help people suffering from malaria in Africa and Asia
高一英语阅读理解中等难度题查看答案及解析
What will the man do during winter break?
A. Go skiing. B. Stay home with his dog. C. Visit some overseas friends.
高一英语短对话中等难度题查看答案及解析
What will the man do during winter break?
A. Go skiing. B. Stay home with his dog. C. Visit some overseas friends.
高一英语短对话简单题查看答案及解析
Mosquitoes have an extraordinary ability to target humans far away and fly straight to their unprotected skin. Regrettably, mosquitoes can do more than cause an itchy( 发痒的)wound. Some mosquitoes spread several serious diseases, including Dengue, yellow fever and malaria.
Over one million people worldwide die from these diseases each year. New research now shows how mosquitoes choose who to bite.
Mosquitoes need blood to survive. They are attracted to human skin and breath. They smell the carbon dioxide gas, which all mammals breathe out. This gas is the main way for mosquitoes to know that a warm-blooded creature is nearby.
But mosquitoes also use their eyes and sense of touch. Michael Dickinson is a professor at the California Institute of Technology. His research shows how these small insects, with even smaller brains, use three senses to find a blood meal.
Michael Dickinson's team used plumes( 烟 )- a material that rises into the air of carbon dioxide gas into a wind tunnel. They then used cameras to record the mosquitoes. The insects followed the plume.
Then, the scientists placed dark objects on the lighter colored floor and walls of the tunnel. Mr Dickinson said, at first, the mosquitoes showed no interest in the objects at all. "What was quite striking and quite surprising is that the mosquitoes fly back and forth for hours. These are hungry females and they completely ignore the objects on the floor and wall of the tunnel, But the moment they get a hit of CO2, they change their behavior quite obviously and now would become attracted to these little visual spots.
This suggested to the researchers that a mosquito's sense of smell is more important in the search for food. Once mosquitoes catch a smell of a human or animal, they also follow visual signals.
1.What do mosquitoes mainly use to find their targets?
A.Sense of smell. B.Sense of touch.
C.Sense of sight. D.Smart brains
2.How did the mosquitoes respond to the objects firstly in the experiment?
A.They flew to the dark ones B.They caught and stuck to them.
C.They took no notice of them. D.They attached themselves to them
3.How can we avoid being attacked by mosquitoes according to the text?
A.Don't let them see us
B.Use dark objects to stop them
C.Make them fly back and forth for hours
D.Attract them to objects full of carbon dioxide gas
4.What can be the best title for the text?
A.How Do Mosquitoes Survive?
B.How Do Mosquitoes Choose to Bite You?
C.Why Do Mosquitoes Need Blood?
D.Why Do Mosquitoes Attack the Human Being?
高一英语阅读理解中等难度题查看答案及解析