Problem: Write a multi-choice question for the following article: Article: Science can't explain the power of pets,but many studies have shown that the company of pets can help lower blood pressure and raise chances of recovering from a heart attack,reduce loneliness and spread all-round good cheer. Any owner will tell you how much joy a pet brings.For some.an animal provides more comfort than a husband/wife.A 2002 study by Karen Allen of the State University of New York measured stress 1evels and blood pressure in people-half of them pet owners-while they performed 5 minutes of mental arithmetic or held a hand in ice water.Subjects completed the tasks alone,with a husband/wife,a close friend or with a pet.People with pets did it best.Those tested with their animal friends had smaller change in blood pressure and returned most quickly to baseline heart rates.With pets in the room,people also made fewer math mistakes than when doing in front of other companions.It seems people feel more relaxed around pets,says Allen,who thinks it may be because pets don't judge. A study reported last fall suggests that having a pet dog not only raises your spirits but may also have an effect on your eating habits.Researchers at Northwestern Memorial Hospital spent a year studying 36 fat people and their equally fat dogs on diet-and-exercise programs;a separate group of 56 people without pets were put on a diet program.On average,people lost about 11 pounds,or 5% of their body weight.Their dogs did even better,losing an average of 12 pounds,more than 15%of their body weight.Dog owners didn't lose any more weight than those without dogs but,say researchers,got more exercise overall-mostly with their dogs--and found it worth doing.

A: Question: We 1earn from the text that a person with heart disease has a better chance of getting well if _ .Options:A he has a pet companionB he has less stress of workC he often does mental arithmeticD he is taken care of by his familyAnswer:A

Problem: Write a multi-choice question for the following article: Article: In summer, some people avoid outdoor activities because they don't want to get hot and sticky or sun burnt.Luckily, there are some outdoor activities which don't involve breaking sweat. River rafting Hot summer weather and cool water-what a perfect match! River rafting can be both scenic and exciting.When the raft follows a gentle stream, the views of the countryside or valley is like a traditional Chinese painting.And when you enter white water where the riverbed creates a natural roller coaster, you feel a rush of adrenaline .Paddle your raft to the riverbank to have a picnic or barbecue which will taste best when you are starving. Where to find: River rafting trips are usually on offer in mountainous or valley regions such as the Three Gorges. Tips: Wear a helmet and life jacket at all times; bring enough sunscreen; and bring lots of water. Caving People say that the only naturally air-conditioned place in summer is a big cave.It is true.Cave tours featuring light shows are .Now it's time to wear a lamp on your helmet like a mineworker to explore caves in darkness.Exploring unknown caverns and navigating underground rivers is what makes caving so thrilling.Plus, caving can be a very healthy sport, for the oxygen level is usually higher so basically you are having an oxygen spa as the bonus. Where to find: caving can be very risky, so consult local travel agents and go in groups with professional cavers. Tips: Follow your guides; drink enough water to avoid dehydration ; and wear strong and not easily damaged hiking boots. Coastal walking/cycling and beach activities For those who live far away from mountains, coastal regions and beaches are good places to spend time in the summer.With sea breezes in your hair, it is nice to take a hike or cycle ride while enjoying the coastline.If you want to be sportier, try beach games, such as soccer and volleyball.It's a totally different experience from playing on hard courts or grass. Where to find: Just go to the beach or find an urban artificial beach such as the...

A: Question: Helen lives in a big city, where is the best place for her to spend weekends?Options:A A riverbank.B Underground rivers.C An urban artificial beach.D Mountainous areas.Answer:C

Problem: Write a multi-choice question for the following article: Article: When a caterpillar feeds on a tomato leaf , the plant moves rapidly to meet with a defensive response , systematically releasing " proteinase inhibitors " -- proteins that interfere with the caterpillar's digestion -- throughout the plant , especially in the leaves . But how does the message get from the wounded leaf to the rest of the plant ? Most scientists believed the alarm was spread by chemical messengers until a team of researchers headed by David Weldon-- a biologist at the University of East Anglia in Norwich , England -- made a shocking discovery . An injured leaf , the researchers found , sends an electrical signal to warn neighboring leaves of upcoming danger . It's a " terribly tiny current " driven by an electrical potential difference of only 20 millvolts , says Weldon , who measured the voltage after electrodes were attached to the plant's surface . " Right now , all we can say is that there is a correlation , " Weldon notes . " If you wound the plant , you'll see an electrical signal accompanied by a biochemical response . " To learn more about the reaction , Weldon's team plans to insert electrodes within the pant tissue ( rather than on the surface ) to determine what's going on at the cellular level . The findings may help explain other mysteries surrounding plants . For example , many plants start to flower in springtime , as days grow longer , but plants sense the change in the day length through their leaves , while flowers begin to bloom at the buds . " There must be a signal from the leaf to the growing points , " Weldon says . " So far , no one has come up with a convincing chemical mechanism . Maybe an electrical signal is involved . "

A:
Question: What is the function of the " proteinase inhibitors " in tomato plants ?Options:A They create nutritional matterB They produce electrical signalsC They protect the plant from insectsD They cure diseases by changing chemicalsAnswer:C