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Read the text and decide which answer (A, B, C or D) best completes each collocation or fixed phrase.
Whenever we read about the natural world nowadays, it is generally to be giver dire predictions about its (1) ... destruction. Some scientists go so (2) … as to assert that from now on, the world can no longer be called 'natural', insofar as future processes of weather, climate and all the interactions of plant and animal life will no longer carry on in their time-honoured way, unaffected by humans. There will never be such a thing as 'natural weather' again, say such writers, only weather affected by global warming. It is hard to know whether to believe such (3) … of doom, possibly because what they are saying seems too terrible to be true. There are other equally influential scientists who argue that climate, for example, has changed many times over the (4) …, and that what we are experiencing now may simply be part of an endless (5)… of change, rather than a disaster on a global (6) …
Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions.
Do you ever wish you were more optimistic, someone who always (45)____ to be successful? Having someone around who always fears the worst isn't really a lot of (46)____ - we all know someone who sees a single cloud on a sunny day and says, 'It looks like rain.' But if you catch yourself thinking such things, it's important to do something about it.
You can change your view of life, according to psychologist. It only takes a little (47)___, and you'll find life more rewarding as a (48)____. Optimism, they say, is partly about self-respect and confidence but it's also a more positive way of looking at life and all it has to (49)____. Optimists are more (50)_____ to start new projects and are generally more prepared to take risks.
Upbringing is obviously very important in forming your (51)___ to the world. Some people are brought up to depend too much on others and grow up forever blaming other people when anything (52)____ wrong. Most optimists, on the (53)____ hand, have been brought up not to (54)____ failure as the end of the world - they just get on with their lives.
Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions.
The cause of tooth decay is acid, which is produced by bacteria in the mouth. The acid removes minerals from tooth enamel, allowing tooth decay to begin; the saliva in your mouth encourages remineralization and neutralizes the acid. The rate at which bacteria in the mouth produce acid depends on the amount of plaque on the teeth, the composition of the microbial flora, and whether the bacteria of the plaque have been "primed" by frequent exposure to sugar. To keep your teeth healthy, a regular dental hygiene program should be followed.Removing plaque with a toothbrush and dental floss temporarily reduces the numbers of bacteria in the mouth and thus reduces tooth decay. It also makes the surfaces of the teeth more accessible, enabling saliva to neutralize acid and remineralize lesions. If fluoride is present in drinking water when teeth are forming, some fluoride is incorporated into the enamel of the teeth, making them more resistant to attack by acid. Fluoride toothpaste seems to act in another way, by promoting the remineralization of early carious lesions.In addition to a regular dental hygiene program, a good way to keep your teeth healthy is to reduce your intake of sweet food. The least cavity-causing way to eat sweets is to have them with meals and not between. The number of times you eat sweets rather than the total amount determines how much harmful acid the bacteria in your saliva produce. But the amount of sweets influences the quality of your saliva. Avoid, if you can, sticky sweets that stay in your mouth a long time. Also try to brush and floss your teeth after eating sugary foods. Even rinsing your mouth with water is effective.Whenever possible, eat foods with fiber, such as raw carrot sticks, apples, celery sticks, etc., that scrape off plaque, acting as a toothbrush. Cavities can be greatly reduced if these rules are followed when eating sweets.
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Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer for each of the blanks.
The ability to weep is a uniquely human form of emotional response. Some scientists have suggested that human tears are (1) _____ of an aquatic past, but this does not seem very likely. We cry from the moment we enter this world, for a number of reasons. Helpless babies cry to persuade their parents that they are ill, hungry or uncomfortable. As they (2) _____, they will also cry just to attract parental attention and will often stop when they get it. The idea that having a good cry do you (3) _____ is a very old one and now it has scientific validity since recent research into tears has shown that they (4) _____ a natural painkiller called enkaphalin. By fighting sorrow and pain, this chemical helps you feel better. Weeping can increase the quantities of enkaphalin you (5) _____. Unfortunately, in our society, we impose restrictions upon this naturally (6) _____ activity. Because some people still regard it as a (7) _____ of weakness in men, boys in particular are admonished when they cry. This kind of repression can only increase stress, both emotionally and physically.Tears of emotion also help the body (8) _____ itself of toxic chemical waste, for there is more protein in them than in tears resulting from cold winds or other irritants. Crying comforts and calms can be very enjoyable - (9) _____ the popularity of highly emotional films which are commonly (10) _____ “weepies”. It seems that people enjoy crying together almost as much as laughing together.