(Q).
Getting enough sleep on a regular basis is one important way to protect the health of your heart. Poor sleep is associated with a range of cardiovascular problems, including high blood pressure, heart attack, and heart failure. Both men and women are at increased risk for these conditions. But we continue to learn that when it comes to health problems associated with sleep, the particular risks to men and women are not always the same. A new study suggests that for women who already have heart disease, poor sleep may be particularly dangerous to their heart health. Research indicates that poor-quality sleep--and waking too early in particular--is associated with increased inflammation among women with heart disease. There was no similar association found for men, suggesting that women with heart disease and sleep problems may be at particular risk for inflammation that can be damaging to the heart. Researchers at the University of California, San Francisco investigated the relationship between sleep quality and inflammation linked to coronary heart disease. They also sought information about how an association between sleep and inflammation might differ between men and women. Their investigation included 980 men and women at first, and 626 completed the 5-year study. All of those included were suffering for coronary heart disease. The average age of men in the study was 66. Women were slightly younger, with an average age of 64. Researchers measured sleep quality by asking participants to rate their sleep over the previous month. They also asked for reports of some of the most common sleep problems, including difficulty falling asleep, difficulty staying asleep, waking frequently throughout the night, and waking too early in the morning. After 5 years, researchers repeated tests for inflammation and once again sought reports on sleep quality and sleep problems. When they analyzed data for both men and women together, researchers found no links between inflammations and sleep quality. However, when they... The researchers did the study _ . A) to find a cure for women with heart disease B) to know what contributes to inflammation C) to look into the relationship between sleep quality and inflammation D) to track the lifestyle of men and women
(A).
C

(Q).
Anxiety is the appropriate emotion when the immediate personal terror--of a volcano, an arrow, a stab in the back and other disasters, all directed against one's self--disappears. The kind of world that produces anxiety is actually a world of safety, a world in which no one feels that he himself is facing sudden death. The anxiety exists as an uneasy state of mind, in which one has a feeling that something unspecified and indeterminable may go wrong. If the world seems to be going well, this produces anxiety--for good times may end.If the world is going badly--it may get worse. Anxiety tends to be without focus; the anxious person doesn't know whether to blame himself or other people. He isn't sure whether it is the current year of the administration or a change in climate or the atom bomb that is to blame for this undefined sense of unease. It is clear that we have developed a society which depends on having the right amount of anxiety to make it work...While we agree that too much anxiety is harmful to mental health, we have come to rely on anxiety to push us into seeing a doctor about a symptom which may indicate cancer, into checking up on that old life-insurance policy which may have out-of-date provisions in it, into having a conference with Billy's teacher even though his report card looks all right. People who are anxious enough keep their car insurance up, have the brakes checked, don't take a second drink when they have to drive. People who are too anxious either refuse to go into cars at all--and so complicate the ordinary course of life--or drive so tensely and carefully that they help cause accidents. People who aren't anxious enough take chance after chance, which increases the terrible accidents of the roads. According to the author, accidents of the road tend to be caused by_. A) all those who are too anxious B) all those who have anxiety C) those who have no anxiety D) those who are not anxious enough
(A).
D

(Q).
As they migrate, 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 use 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 of feet above ground. Only recently have scientists developed technologies that can detect such little creatures at such great heights. To their surprise, 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 wintering 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 that 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 farmers decide when to spray their crops. Scientists originally thought that _ . A) insects always waited for their favorable winds B) insects chose the winds they wanted to ride C) insects were just blown about by the wind D) insects positioned themselves in the winds
(A).
C