C．were small children D． were successful actresses

　　60．As can- be seen from the passageFontaine was a person who was

　　．

　　A． disliked by her family B． always a troubled wife

　　C． able to do few jobs D． gifted in many ways

　　—60、ABBCCD

　　较难题目特训：科普知识类

　　Plants can’t communicate by moving or making sounds, as most animals do. Instead, plants produce volatile compounds, chemicals that easily change from a liquid to a gas. A flower’s sweet smell, for example, comes from volatile compounds that the plant produces to attract insects such as bugs and bees.

　　Plants can also detect volatile compounds produced by other plants. A tree under attack by hungry insects, for instance, may give off volatile compounds that let other trees know about the attack. In response, the other trees may send off chemicals to keep the bugs away—or even chemicals that 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 compounds that crop plants make when they’re attacked. Scientists say the e-nose could help quickly detect whether plants are being eaten by insects. But today the only way to detect such insects is to visually inspect individual plants. This is a challenging task for managers of greenhouses, enclosed gardens that can house thousands of plants.

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