Her health has been _________ progressively for several months.

There will be an increasing number of retired and elderly people to ______ by a progressively smaller number of workers.

逐渐拧紧螺栓。 A: Torque the bolts gradually. B: Apply progressive torque to the nut. C: Torque bolts progressively.

Although the national government has introduced some new laws on this subject, it is the ______ state governments which are responsible for pollution control. A: precisely B: primarily C: progressively D: preliminarily

Although the national government has introduced some new laws on this subject, it is ________ the state governments which are<br/>responsible for pollution control. A: precisely B: primarily C: progressively D: preliminarily

Although the national government has introduced some new laws on this subject, it is the ________ state governments which are responsible for pollution control. A: A precisely B: B primarily C: C progressively D: D preliminarily

What does the word ‘ clutch ’ mean in the sentence, ‘To get the car go, depress the clutch pedal, put the gear lever into first gear, then depress the accelerator pedal with your right foot, while progressively releasing the clutch with your left foot.’? A. 踏板 B. 离合器 C. 刹车

High Stress May Damage Memory According to a report issued in May 1998, elderly people who have consistently high blood levels of cortisol don’t score as well on memory tests as their peers with lower levels of the stress hormone. What’s more, high levels of cortisol are also associated with shrinking of the hippocampus, a region of the brain that plays a key role in learning and memory. The finding suggests that even cortisol levels in the normal, “healthy” range can actually accelerate brain aging. The study results “now pride substantial evidence that long-term exposure to adrenal stress hormones may promote hippocampal aging in normal elderly humans,” write Nada Porter and Philip Landfield of the University of Kentucky in Lexington in their editorial. When people feel too worried or nervous or when they overwork, the stress appears. Cortisol is a hormone released in response to stress by the adrenal glands, which sit on top of the kidneys. Over a 5 to 6-year period, Dr. Sonia Lupien and his colleagues measured 24-hour cortisol levels in 51 healthy volunteers, most of whom were in their 70s. Despite wide variation in cortisol levels, the participants could be divided into three subgroups: those whose cortisol progressively increased over time and was currently high (increasing/high); those whose cortisol progressively increased over time and was currently moderate (increasing/moderate); and subjects whose cortisol decreased, but was currently moderate (decreasing/moderate). The researchers tested the volunteers’ memory on six people in the increasing/high category and five people in the decreasing/moderate group. The groups did not differ on tests of immediate memory, but the increasing/high cortisol group had other memory problems compared with those in the decreasing/moderate group. The researchers also found that the total volume of the hippocampus in those in the increasing/high group was 14% lower than those in the decreasing/moderate group, although there were no differences in other brain regions. The results suggest that “… brain again can be accelerated by levels of adrenal hormones that are not generally regarded as pathological and that variation within this normal range is related to variation in the rate of brain aging,” write Porter and Landfield. “This further suggests that chronic stress may accelerate the worsening of hippocampus.”