1 . It was the dead of winter when Dad told me that he found a delicate small bag in the snow on his way out of a doctor’s appointment. “It was filled with seeds, so I planted them in pots in the living room window that gets such great light.” Dad was excited to have a planting project in the winter. He missed tending his garden plot, which was the size of a small farm.
I now lived out of state, but Dad reported in his daily phone calls, “These plants seem to double in size overnight. It’s only been a few weeks, and they are almost touching the ceiling.” Since Dad had green fingers, I wasn’t surprised about that. I couldn’t imagine what plant would do so well. I knew photos would not come soon because Dad had to use up the film in his camera and then developed the pictures.
During one call, Dad said, “Today at work, one of my co-workers was wearing a T-shirt with a screen-printed picture of the same leaf as my mysterious houseplants. I told him that I had those same herbs, which were growing like weeds, and I had to get rid of them.” Dad continued, “He eagerly took them off my hands, and now I can see out the window again.”
This awakened my curiosity, and I decided to do some research. In those days, that meant going to the library’s reference section. I did some reading and photocopied some articles. I mailed them to my father.
Dad called, “I just couldn’t believe what I read in the papers you sent. Those pictures are exactly what my plants looked like. No wonder my co-worker was so willing to take them.”
We both laughed till we cried when we realized my father had just raised a harvest of precious Chinese herbs used to ease pain.
1. Why did Dad plant the seeds?| A．Because it was the doctor’s advice. |
| B．Because he had a small farm at home. |
| C．Because it satisfied his eagerness for gardening. |
| D．Because the seeds would bring him rich rewards. |
| A．Dad’s gardening talents. |
| B．The herbs’ growing quickly. |
| C．Dad’s efforts to tend the seeds. |
| D．A planting project in the winter. |
| A．He had little interest in the plants. |
| B．He recognized the value of the plants. |
| C．He desired to learn from the author’s dad. |
| D．He wanted to show his knowledge about plants. |
| A．Seed catcher | B．Window scenery | C．Helpful co-worker | D．Innocent gardener |
2 . For many people, catching a smell of freshly cut grass is a pleasant sign that warmer weather is here to stay. For the grass, however, this scent signals an entirely different story.
The smell we associate with freshly cut grass is actually a chemical SOS, one used by plants to beg nearby creatures to save them from attack. After all, when danger strikes —whether it's gardening equipment or a hungry caterpillar — plants can't lift their roots and run. They must fight where they stand. To protect themselves, plants employ a string of molecular (分子) responses. These chemical communications can be used to poison an enemy, warn surrounding plants of dangers or attract helpful insects to perform needed services.
Clearly, plants can communicate. But does that mean they can feel pain? According to some researchers, plants release gases that are the equivalent of crying out in pain. Using a laser-powered microphone, researchers have picked up sound waves produced by plants releasing gases when cut or injured. Although not audible to the human ear, the secret voices of plants have revealed that cucumbers scream when they are sick, and flowers cry when their leaves are cut.
There's also evidence that plants can hear themselves being eaten. Researches show that plants understand and respond to chewing sounds made by caterpillars dining on them. As soon as the plants hear the noises, they respond with several defense mechanisms.
For some researchers, evidence of these complex communication systems — giving out noises via gas when in pain — signals that plants feel pain. Others argue that there cannot be pain without a brain to register the feeling. Still more scientists infer that plants can exhibit intelligent behavior without possessing a brain or conscious awareness.
As they grow, plants can change their paths to avoid obstacles or reach for support with their tendrils (卷须). This activity comes from a complex biological network distributed through the plants' roots, leaves and stems. This network helps plants reproduce, grow and survive.
1. What does the smell of freshly cut grass signal?| A．Warmer weather. | B．Being poisonous. |
| C．Cry for help. | D．The need of services. |
| A．By giving out gases. | B．By changing the color of their leaves. |
| C．By producing audible sound waves. | D．By sharing it through the root systems. |
| A．Their tendrils. | B．Their biological network. |
| C．Their communication systems. | D．Their conscious awareness. |
| A．Do plants feel pain? | B．How plants protect themselves? |
| C．Do plants communicate? | D．How plants grow and reproduce? |
3 . Our world is full of sounds. Sound is so essential to life and survival that it made Tel Aviv University researcher Lilach Hadany ask: What if it wasn't just animals that could sense sound—what if plants could, too?
“Sounds are a natural resource-one that plants would be wasting if they didn’t take advantage of it as animals do,”said Hadany. If plants had a way of hearing and responding to sound, she figured, it could help them survive and reproduce.
Hadany's team started their study by investigating flowers. Evening primrose（夜来香）, which grows wild on the beaches and in parks around Tel Aviv, emerged as a good candidate, since it has a long bloom time and produces measurable quantities of nectar（花蜜）.
To test the primroses in the lab, Hadany's team exposed plants to five sound treatments: silence, recordings of a honeybee from four inches away, and computer generated sounds in low, intermediate（中等的）, and high frequencies. Plants given the silent treatment had no significant increase in nectar sugar concentration. The same went for plants exposed to high-frequency（158 to 160 kilohertz）and intermediate-frequency（34 to 35 kilohertz）sounds.
But for plants exposed to playbacks of bee sounds（0.2 to 0.5 kilohertz）and similarly low-frequency sounds（0.05 to 1 kilohertz）, the final analysis revealed an unmistakable response. Within three minutes of exposure to these recordings, nectar sugar concentration in the plants increased by 20 percent.
A sweeter treat for pollinators（传粉者）, their theory goes, may draw in more insects, potentially increasing the chances of successful cross-pollination. Indeed, in field observations, researchers found that pollinators were more than nine times more common around plants another pollinator had visited within the previous six minutes.
“We were quite surprised when we found out that it actually worked.” said Hadany.“But after repeating it in other situations, in different seasons, and with plants grown both indoors and outdoors, we feel very confident in the result.”
1. Why did Hadany's team expose plants to sound treatments?| A．To see if they would respond to sound. |
| B．To develop their ability to receive sound. |
| C．To help them benefit from different sounds. |
| D．To detect the difference between plants and animals. |
| A．Flowers like primroses | B．Sounds like those of bees. |
| C．Visits from other pollinators. | D．Exposure to different sounds |
| A．Plants can identify different sounds. | B．Sound attracts more pollinators to flowers. |
| C．Plants produce nectar when pollinators come. | D．Sound plays an important role in insects’ survival. |
| A．It was doubtful. | B．It was unexpected. | C．It was acceptable | D．It was satisfactory. |
