完型填空

　　Ginger, our beautiful golden bunting dog, isn't with us anymore．She 　　　1　 cancer several years ago．But, while sharing our home, she 　　2　　 such joy and love into our lives 　　3　　 we still miss her．

　　There are so many 　　4　　 stories about the love in this dog, but my favorite is one that created an everlasting image of how to kindly 　　5　　 what is needed without reserve．

　　It was an autumn day is State of Connecticut．However, the weather didn't seem to know the 　　6　　 between fall and winter．Unexpectedly, we were hit with a big 　　7　　 for which no one was prepared．

　　In our backyard we have two apple trees, whose fruit was Ginger's beloved diet．When she went outside, she'd grab an apple, stick it far back in her 　　8　　, and take it into the house to 　　9　　 for eating later．The apples has been on the 　　10　　 and were often muddy so I wasn't always happy that Ginger had brought them into the house．　　11　　 my unhappiness, she would turn her head so I wouldn't see her hidden treasure．It was our little game．

　　On the day that it snowed too early in the season, Ginger went outside and I 　　12　　 her from the window．I noticed that she was anxiously 　　13　　 holes and bringing the apples to the surface so they could be seen above the snow．I wondered 　　14　　 she was doing this．She seemed to be 　　15　　 with some kind of assignment to dig up as many apples as possible during her yard time．

　　When I called her back into she house, she had her 　　16　　 one apple in her mouth．About five minutes later．I looked outside．The yard was completely 　　17　　 with birds．Ginger had dug up all those apples for her bird and squirrel friends to eat．She knew that they wouldn't have stored enough food to 　　18　　 such an early winter!

　　Tears sprang to my eyes as I 　　19　　 this beautiful act of unconditional love from an animal who thought us how to serve life with such 　　20　　．

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阅读理解

　　Plants can't communicate by moving or making sounds, as most animals do．Instead, plants produce volatile compounds(挥发性化合物)——chemicals that easily change from a liquid to a gas．A flower's sweet smell, for example, comes from such volatile compounds to attract insects such as bugs and bees．

　　Plants can also discover volatile compounds produced by other plants．A tree under attack by hungry insets, for instance, may give off these chemicals in order to let other trees know about the attack．In response, the other trees may send off their chemicals to keep the bugs away——or even chemicals that will attract the bugs’ natural enemies．

　　Now scientists have created a quick way to understand what plants are saying： a chemical sensor(传感器)called an “electronic nose”．The “e-nose” can tell such compounds as plants make．When plants are attacked, scientists say, the e-nose could help quickly decide whether plants are being eaten by insects．But today, the only way to spot such insects is to inspect individual plants by observing them．This is a challenging task for managers of greenhouses, including those that can house thousands of plants．The research team is working with an e-nose that can recognize volatile compounds．Inside the device, 13 sensors chemically react with volatile compounds based on the interactions(相互作用), and then the e-nose will give off electronic signals that the scientists can analyze by using computer software．

　　To test the e-nose, the team presented it with healthy leaves from cucumber, pepper and tomato plants, all being common greenhouse crops．Then scientists collected samples of the air around damaged leaves from each type of crop．These plants had been damaged either by insects or by scientists who made holes in the leaves with a hole punch(打孔器)．

　　The e-nose, it turns out, can identify healthy cucumber, pepper and tomato plants based on the volatile compounds they produce．It could also identify tomato leaves that had been damaged．But even more impressive, the device could tell which type of damage——by insects or with a hole punch——had been done to the tomato leaves．

　　With some fine-tuning(微调), a device like the e-nose can one day be used in greenhouses to quickly spot harmful bugs, the researchers say．A device like this can also be used to identify fruits that are perfectly ripe and ready to pick and eat, says Natalia Dudareva, a biochemist at Purdue University in West Lafayette, India, who studies smells of flowers and plants．Hopefully, scientists believe, the device can bring large benefits to greenhouse managers in the near future．

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