Extra boiling water should be kept at hand just ______ it is needed.
A. as B. because
C. in case D. as if
高三英语单项填空简单题
Extra boiling water should be kept at hand just ______ it is needed.
A. as B. because
C. in case D. as if
高三英语单项填空简单题查看答案及解析
The housewife got her hands and arms _____ while trying to pour the boiling water from the kettle into the thermos; she ______ some healing ointment to her burn but the pain was still unbearable
A.burned; put | B.burnt; used | C.burnt; dressed | D.burnt; applied |
高三英语单项填空中等难度题查看答案及解析
Those extra pounds should be avoided at all costs, right? Actually, while being overweight isn’t generally good for our health, not all fat is created equal — some may even be beneficial.
There are two major kinds of body fat. White fat, the most abundant type, is what you feel when you squeeze your midsection. Brown fat, found mainly in the neck region, burns energy rather than storing it the way white fat does. Brown fat may also help avoid diabetes. According to a study in Cell Metabolism, individuals with higher amounts of brown fat had smaller changes in blood sugar and thus a reduced risk of developing diabetes. Infants have high levels of brown fat, which helps regulate their body temperature. Sadly, we lose it as we age, and adults have only small amounts.
Adults can increase brown fat by exposing themselves to cold temperatures. In a recent study, people who slept in a mildly cold room (about 66 degrees F) increased the amount and activity of their brown fat by up to 40 percent. Sleeping in mild warmth (81 degrees F), however, decreased their amount of brown fat. Cold showers don’t seem to affect it.
Brown fat does have its drawbacks. Radiologists don’t like it, because the heat it causes makes it harder for body scans to detect activities in patients. Although there’s no firm evidence that any specific foods or nutrients can activate brown fat, radiologists routinely recommend that patients eat a high-fat, low-carb diet before scans on the grounds that this reduces brown fat activation.
Just as brown fat isn’t perfect, neither is white fat all bad. Even though people tend to hate it, white fat delivers important health benefits. It protects our vital organs, helps keep us warm, and stores calories for later use, keeping us from starving when food is scarce.
White fat can sometimes be turned into brown — it’s then called beige or brite (“brown in white”) fat. Like brown fat, beige fat burns energy and can thus help fight against obesity. Scientists are still trying to figure out how the change happens; one study points to a hormone called irisin, which our muscles produce when we exercise.
Fat cells’ sensitivity to temperature changes means there’s more than one way we can get rid of unwanted fat. Cooling treatments, for instance, freeze fat cells to death. The body removes these damaged cells over several months.
1.Which of the following can replace the underlined word “midsection” in the second paragraph?
A.Leg. B.Arm. C.Wrist. D.Waist.
2.Generally speaking, who have a larger proportion of brown fat?
A.Babies. B.Senior people. C.Fat people. D.Thin people.
3.The following kinds of fat can help people fight against obesity EXCEPT ________.
A.Beige fat. B.Brite fat. C.White fat. D.Brown fat.
高三英语阅读理解中等难度题查看答案及解析
The medicine should usually be kept out of the ________ of children at home.
A. distance B. reach C. limit D. arrival
高三英语单项填空中等难度题查看答案及解析
Imagine looking at something and being able to move it just by using your brain!That is exactly what the new technology called BrainGate can do —with the help of a robotic arm,anyway.
BrainGate is the idea of Professor John Donoghue and his team of researchers at the Brown Institute for Brain Science,USA. BrainGate is attached directly to the brain. First of all,gold wires are put into the part of the brain that controls movement. These are then connected to a small computer chip(芯片) . When the person thinks about different movements,this creates electrical signals,which are picked up by the chip. After this,the signals that are created by the brain are sent back to a computer,which changes the signals into movements. Finally,the computer uses the robotic arm to carry out these movements. BrainGate can already be used to write an e-mail or play computer games,just by brain power.
The technology has already cost millions of dollars to develop and when it is available for use,it will probably cost thousands of dollars per person. There are still many challenges ahead for Donoghue and his team. They are currently planning a mini wireless version,which will allow people to be connected to the computer at all times. Donoghue also dreams of using this technology to help disabled people who can't move their arms or legs. He plans to connect BrainGate directly to their own paralysed limbs(瘫痪的胳膊或腿) .This will mean that the person can control their own body again,without relying on a robotic arm.
This research is attracting the military's (军方的) attention as well. However,it is easy to understand why scientists might be concerned about how thought-controlled machines could be used by the military.
1.What does the underlined word “These” refer to?
A. Movements. B. Thoughts.
C. Brains D. Wires.
2.What is one of BrainGate's disadvantages?
A. It needs improvement. B. It produces few movements.
C. It is too expensive. D. It is difficult to control.
3.How will Donoghue help disabled people?
A. By developing a wireless version.
B. By replacing their limbs with robotic ones.
C. By making BrainGate smaller.
D. By attaching BrainGate to their bad limbs.
4.What does the military think of thought-controlled machines?
A. They could lead to disasters. B. They would face fierce competition.
C. They could be useful. D. They would be in mass production.
高三英语阅读理解中等难度题查看答案及解析
(2014·天津和平区一模)The medicine should usually be kept out of the________of children at home.
A.distance B.reach
C.limit D.arrival
高三英语单项填空中等难度题查看答案及解析
227. It is necessary that the question _______ at once.
A.should settle | B.be settled | C.might be settled | D.would be settled |
高三英语单项填空简单题查看答案及解析
Medicine should always be kept out of the ________of children at home.
A.distance B.limit C.reach D.arrival
高三英语单项填空中等难度题查看答案及解析
It is 10 o’clock now. He _____ be back at any time.
A.must | B.should | C.may | D.can |
高三英语单项填空中等难度题查看答案及解析
A small dog should be belly-up after eating a handful M&M’s, at least according to conventional wisdom. But watching “Moose”, a friend’s five-pound Chihuahua, race around a living room after his sweet snack makes one wonder: Is chocolate truly poisonous to dogs?
Dogs and humans have similar tastes. But unlike humans, our companions experience dangerous effects from eating chocolate — it can poison them and in some cases is fatal. Chocolate’s danger to dogs depends on its quality.
Chocolate is processed from the bitter seeds of the cocoa tree, which contain a family of compounds known as methylxanthines(一种衍生物). This class of substances includes caffeine and the related chemical theobromine(可可碱). Chocolate contains a significant amount of theobromine and smaller amounts of caffeine. These chemicals can cause a dog’s heart to race up to twice its normal rate, and some dogs may run around as if “they drank a gallon of espresso,” according to Hackett.
Dogs are capable of handling some chocolate, but it depends on the animal’s weight and the type of chocolate it eats. Unsweetened baking chocolate contains more than six times as much theobromine as milk chocolate, although amounts vary between cocoa beans as well as different brands of chocolate. Less than four ounces of milk chocolate is potentially fatal for Moose and other small dogs.
Around every confection-centered holiday — Valentine’s Day, Easter and Christmas — at least three or four dogs are hospitalized overnight in the animal medical center at Colorado State. But in 16 years, Hackett has seen just one dog die from chocolate poisoning, and he suspects it may have had an underlying disease that made it more exposed to chocolate’s heart-racing effect.
1. The underlined expression “belly-up” probably means______.
A. dead B. poisonous C. running around D. having a headache
2. All of the following are true EXCEPT______.
A. chocolate’s danger to dogs depends on its quantity and quality
B. people buy lots of chocolate around Valentine’s Day
C. an ounce of unsweetened baking chocolate is safe for Moose
D. there must be some theobromine or caffeine in espresso
3. What can we learn about Hackett?
A. He is an animal doctor. B. He is a pet shop owner.
C. He is the owner of Moose D. He is a doctor in a small hospital.
4. It can be inferred from the passage that Hackett believes that__________.
A. chocolate is truly deadly to dogs
B. it’s OK to give chocolate to a big dog
C. pets are usually ignored around confection-centered holidays
D. a healthy dog probably could survive a chocolate poisoning
5. The passage is mainly about__________.
A. the poisoning of Moose
B. the compounds of different chocolates
C. a handful M&M’s chocolate is poisonous
D. the relation between methylxanthines and chocolate poisoning
高三英语阅读理解简单题查看答案及解析