题目

1. Do you think that he had e______ so many difficulties? 2. Our teacher tell us plants d_____ from seeds. 3. It’s not good for parents to s_____ their children. 4. This Sunday I am going to the b_____ garden for trip in our city. 5. Australia is very large, but the p_____ is quite small. 答案：1.experenced 2.develop  3.spoil  4.botanical  5.population下列说法不正确的是A.金刚石晶体中，键角为109°28′B.石墨晶体中，键角为120°C.NaCl晶体中，每个Na+周围有6个Cl－D.干冰晶体中，CO2分子间以共价键相结合