B

Being an astronaut sounds cool，doesn't it? In space，they get to do some pretty amazing things，like floating in zero gravity．

However，there are also plenty of things that astronauts can’t do because of their weightless environment，and that’s very sad．What's worse，they can’t even let their sadness show—because it's impossible to cry in zero gravity．

Of course，astronauts can still produce tears．But crying is much more difficult in space，reported The Atlantic in January．Without gravity，tears don’t flow downward out of the eyes like they do here on Earth．This means that when you cry in space，your tears have nowhere to go—they just stick to your eyes．

In May 2011，astronaut Andrew Feustel experienced this during one of his spacewalks．”Tears，”he said，”don’t fall off of your eyes…They just kind of stay there．”

Besides making your vision unclear，this can also cause physical pain．Back on Earth，tears are supposed to bring comfort to the eyes．But that’s not the case in space．The space environment dries out astronauts’eyes，and when tears suddenly wet the eyes，it can cause pain rather than comfort．”My right eye is painful like crazy．”Feustel told his teammate during the walk．

Since gravity doesn’t work in space，astronauts need some extra help to get rid of the tears．Feustel chose to rub his eyes against his helmet to wipe the tears away．Another choice is to just wait—“When the tears get big enough they simply break free of the eye and float around，”astronaut Ron Parise told The Atlantic．

There are lots of small things——things like crying—that we are so used to on Earth．We usually take them for granted，until they become a problem in a totally different environment，like space．There，astronauts can’t talk to each other directly．They also can’t eat or drink in normal ways．They can’t even burp(打嗝)，because there is no gravity to hold the food down in their stomach．If they do burp，they just end up throwing up(呕吐)everything in their stomach，according to the UK National Space Center．

Thus，perhaps it's only space explorers who can honestly say：”Gravity，you’re the best．”

24．According to the text，which of the following is right?

A．Astronauts will never feel sad in space． B．Tears produced in space don't flow downward．

C．Astronauts produce bigger tears in space．D．Tears produced in space can’t be wiped away．

25．What effect do tears have on astronauts in space?

A．They cause them physical pain． B．They make them see much clearer．

C．They float around and cause danger． D．They bring them comfort to their eyes.

26．What's mainly talked about in paragraph 7?

A．Things that humans can’t do without gravity．

B．How to cure burping and throwing up in space.

C．Suggestions on how to stay comfortable in space．

D．Other basic things that are difficult to do in space．

27．The text is probably taken from________．

A．all education report． B．a school bulletin.

C．a science magazine． D．a local newspaper．
 

C

Being sociable looks like a good way to add years to your life．Relationships with family，friends，neighbors，even pets，will all do the trick，but the biggest longevity(长寿)boost seems to come from marriage or an equiva1ent relationship．The effect was first noted in 1858 by William Farr，who wrote that widows(丈夫去世的女士)and widowers were at a much higher risk of dying than their married peers．Studies since then suggest that marriage could add as much as seven years to a man’s life and two to a woman’s．The effect holds for all causes of death，whether illness，accident or self-harm．

Even if the odds are stacked against you，marriage can more than compensate．Linda Waite of the University of Chicago has found that a married older man with heart disease can expect to live nearly four years longer than an unmarried man with a healthy heart．Likewise，a married man who smokes more than a pack a day is likely to live as long as a divorced man who doesn’t smoke．There’s a flip side，however，as partners are more likely to become ill or die in the couple of years following their spouse’s death，and caring for a spouse with mental disorder can leave you with some of the same severe problems．Even so，the odds favor marriage．In a 30-year study of more than l0，000 people，Nicholas Christakis of Harvard Medical School describes how all kinds of social networks have similar effects．

So how does it work? The effects are complex，affected by socio—economic factors，health-service provision，emotional support and other more physiological(生理的)mechanisms．For example，social contact can boost development of the brain and immune system，leading to better health and less chance of depression later in life. People in supportive relationships may handle stress better．Then there are the psychological benefits of a supportive partner．

A life partner，children and good friends are all recommended if you aim to live to l 00．The ultimate social network is still being mapped out，but Christakis says：“People are interconnected，so their health is interconnected．”

28．William Farr’s study and other studies show that___________.

A．marriage can extend one’s lifetime a lot．

B．being sociable can improve one’s quality of life.

C．women benefit more from marriage than men．

D．social life can help one recover from illness.

29．Linda Waite’s studies support the idea that________．

A．smoking does no harm to married men．

B．marriage can help make up for ill health.

C．the married are happier than the unmarried．

D．unmarried people are likely to suffer more in life.

30．What does Nicholas Christakis say about social networks?

A．They serve as the best way to handle stress．

B．They provide timely support for those in need.

C．They help develop people’s community spirit．

D．They have similar positive effects as a marriage.

31．What can be inferred from the last paragraph?

A．We should share our social networks with each other．

B．To stay healthy，one should have a proper social network．

C．A good relationship can ensure your living to 100．

D．One can develop relationship more easily with children．
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