【正文】 erall.“Everywhere you look，plants are growing right up next to other plants，” Dudley said，pointing out that usually it’s a case of each plant for itself.“But sometimes those plants are related，and there are benefits to not wasting resources on being petitive.”How the plants determine which of their neighbors are siblings remains a mystery，Dudley and memory appear to be important for kin recognition in animals，but this isn’t an option for plants，she researchers speculate (推測) that plants municate through their roots，identifying themselves using tiny chemical signatures specific to each plant’s family.The new study may have important implications (影響) for agriculture，Dudley added，since petition between plants can reduce crop yields. Planting more cooperative siblings together instead of strangers could theoretically mean better harvests.5．What’s the main idea of this passage?A．Plants can recognize and municate with their relatives.B．Plants can be as clever as animals.C．Study finds a good way to increase crop yields.D．Study proves petition exists between plants.6．According to the study，sea rocket________.A．usually lived with unrelated neighborsB．grew taller than its neighborsC．showed kindness among siblingsD．needed a petitive environment7．The underlined word “restraining” in Paragraph 2 probably means________.A．exciting B．limitingC．counting D．keeping8．Which of the following is NOT true of kin selection?A．It is also found in the case of sea rocket.B．It usually helps animals adapt to their environment.C．It reduces petition between family members.D．It is a mon petition in the animal world.Ⅰ.單項填空1．D　該題考查形容詞作狀語。5．A　now and then意為“不時，時而”，符合句意。11．C　此題考查名詞詞義的辨析。句意為：在排隊等了半個小時后，湯姆突然意識到他把錢包忘在家里了。2．C　推理判斷題。根據(jù)文章內(nèi)容尤其是第一段內(nèi)容可知本文的主題為“植物能辨認它們的‘親戚’并進行交流”。