W: I just found the most useful device at that new outdoor store, a water purifier.
M: A water purifier You want to carry even more equipment with you on our hiking trips
W: If it’s lightweight and saves work, yes. And this one fits that description.
M: Really I bet it takes up a lot of room.
W: Not at all. It’s a straw. Much like the one you use to drink a soda or milkshake.
M: Really That is small.
W: Ya. It’s a plastic, and has a series of mineral and chemical filters that strain harmful microbes from water.
M: Yes. But how good a job can it do filtering the germs out of stagnant pond water or water from lake and streams
W: It’s fantastic. It makes the water entirely germ free.
M: But, what about salt or chemical pollutants that maybe in the water. Does it clean those out
W: No, it doesn’t remove salt and chemicals, but those are not really major concerns when we
A. In restaurants.
B. On camping trips.
C. In science laboratories.
D. On car trips.
| Most earthquakes occur within the upper
15 miles of the earth’s surface. But earthquakes can and do occur at all depths
to about 460 miles. Their number decreases as the depth increases. At about 460
miles one earthquake occurs only every few years. Near the surface earthquakes
may run as high as 100 in a month, but the yearly average does not vary much. In
comparison with the total number of earthquakes each year, the number of
disastrous earthquakes is very small. The extent of the disaster in an earthquake depends on many factors. If you carefully build a toy house with an Erector set, it will still stand no matter how much you shake the table. But if you build a toy house with a pack of cards, a slight shake of the table will make it fall. An earthquake in Agadir, Morocco, was not strong enough to be recorded on distant i A. The number of earthquakes is closely related to depth. B. Roughly the same number of earthquakes occur each year. C. Earthquakes are impossible at depths over 460 miles. D. Earthquakes are most likely to occur near the surfaces. [填空题]
Learning specialists found most boys are having, while young girls are thriving in schools. [单项选择]Researchers found hospital admissions for heart failure have______.
A. increased B. dropped C. been the same for twenty years D. disappeared [单项选择]
I have always found country life most (76) . The city, a place for business is only to be visited; it is not an ideal place for (77) residence. People may say that the city can provide you with the best (78) life can offer. [填空题]Your heart is the single most important muscle in your body, but keeping it in (36) doesn’t require a fancy gym membership or hours of tiring workouts. Squeezing a few brisk walks into your week is all it takes—and because heart disease is the (37) cause of death among women in America, you should get moving now. If you’re over 40, a walking program can reduce you (38) of heart disease by up to 40 percent, as well as (39) your blood pressure, make your heart pump blood more (40) , and improve your circulation. Studies show that regular aerobic exercise, like walking, also reduces stress and (41) fat, says cardiologist Nieca Goldberg, medical director of New York University’s Women’s Heart Program.
Our plan is based on the latest (42) from the American Heart Association and the American College of Sports Medicine, which suggest two different walking (43) , depending on your fitness level, to h 我来回答: 提交
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