题目

下列关于植物激素及其类似物在农业生产实践中的应用，符合实际的是（ ）A. 西瓜结果后，喷洒一定量的脱落酸可防止果实的脱落B. 一定浓度的细胞分裂素促进细胞生长，使细胞体积増大C. 利用低浓度2，4-D作除草剂，可抑制农田中杂草的生长D. 用一定浓度的赤霉素溶液处理芦苇等植物，可使植株增高 答案：【答案】D【解析】植物五大激素作用：生长素：促进细胞的生长（伸长）；促进果实的发育（培养无籽番茄）；促进扦插的枝条生根；防止果实和叶片的脱落；赤霉素：促进细胞伸长、引起植株增高，促进种子萌发和果实成熟；细胞分裂素：促进细胞分裂（分布在根尖）；脱落酸：抑制细胞分裂，促进阅读理解 　　Buses leave the Railway Station, New York City, from 7:00 a. m and then every half hour, until 11: 36 p. m. (7 days a week). 　　Buses leave Brennan Station 20 minutes before and after every hour from 6: 20 a. m. to 10: 40 p. m. (7 days a week). 　　Evening rush hours (5: 00 p. m. to 7: 00 p. m.): Buses leave the Railway Station, New York City, every 15 minutes (MondayFriday). 　　Holiday: Buses leave every hour on the hour (正点) (Trip time: 30 minutes each way). 　　All tickets must be bought at Window 12, the Railway Station, New York; or at the Brennan Station Window. 根据短文内容，选择正确答案。 1．At which of the following times does a bus leave New York City for Brennan of Thursday? [　　] A．8:30B．10:15 C．3:14D．11:45 2．If you had to meet a friend in New York City at 10:20 a. m. on a Friday, you could take a bus from Brennan. Which is the latest bus? [　　] A．The 8:10 a. m. busB．The 9:40 a. m. bus C．The 8:40 a. m. busD．The 9:20 a. m. bus 3．What time does a bus leave Brennan for New York City on Saturday? [　　] A．5:40 a. m.B．9:00 a. m. C．10:20 p. m.D．11:40 p. m. 4．If you want to take a bus in evening rush hours, you should take the ________ bus in the Railway Station, New York City on Monday. [　　] A．6:20 p. m.B．5:45 p. m. C．8:00 p. m.D．7:15 p. m. 5．Where could a ticket be bought? [　　] A．From the bus driver. B．On the bus. C．At the window with the above instructions. D．At a ticket window in the Railway Station, New York City or the Brennan Station.