题目

下列属于硝化细菌具有的属性的是（）①无叶绿素 ②异养生物 ③能氧化氨 ④能将CO2和H2O合成糖类 A . ①②③ B . ①③④ C . ①②④ D . ②③④ 答案：B 选词填空 1．In 1976, a strong earthquake ________ Tangshan． 2．Pudong New District(浦东新区)has started to ________ and collect garbage from families to help improve the environment． 3．They are very young, so they haven’t ________ much． 4．Businessmen are ________ to invest(投资)in Hefei． 5．Those who were not satisfied with the result ________ in front of the government hall． 6．A new set of learning rules was ________ by him last year, which is now very popular with English learners． 7．The company ________ the applicants to have at least one year experience． 8．They three will ________ in the long jump． 9．It will take about 20 years to ________ the Three Gorges Dam on the Yangtze River．