题目

词汇运用。用括号内所给词的适当形式填空。 1. If it _____(snow), my father ________(take) me to school in his car. 2. Tigers _________(catch) their own food if they live in the wild. 3. If he _____(live) in London, he __________(visit) the Big Ben. 4. “Don’t ______(worried),” she said. “I’ll help you if you can’t finish it.” 5. He warned us ______(not phone) her when she was asleep.下列属于生态系统的是（ ）A．草原上的全部羊B．洞庭湖中的所有生物C．大兴安岭林区D．河里的鱼