题目

将具有一对相对性状的纯种豌豆个体间行种植，另将具有一对相对性状的纯种玉米个体间行种植，通常情况下，具有隐性性状的一行植株上所产生的F1是（ ） A．豌豆和玉米都有显性个体和隐性个体B．玉米都为隐性个体，豌豆既有显性又有隐性C．豌豆和玉米的显性和隐性比例都是3：1D．豌豆都为隐性个体，玉米既有显性又有隐性根据句意和所给的首字母完成单词。 1. In most parts of China, students r            bikes to school. 2. My family will take the t             to Beijing next week. 3. It's around 1,500 k               from Beijing to Tianjin. 4. They had a q             meal and then went to school in a hurry. 5. She is i            in hospital. Let’s go to see her after school. 6. The e             bird catches the worm. 7. There is no m            of getting there.  8. English is a b            to the world. 9. We must be in the same b          to overcome the difficulty. 10. Whether(是否) we'll go for a picnic d           on the weather.