题干

如图为测定链霉素对3种细菌的抗生素效应,用三种细菌在事先准备好的琼脂块平板上画3条等长的平行线(3条线均与图中链霉素带接触),将平板置于37℃的条件下恒温培养3天,结果如图所示.从实验结果来看,关于对链霉素的叙述不正确的是(   )



A:它能阻止结核杆菌生长

B:它对结核杆菌比对霍乱菌更有效

C:它对结核杆菌比对伤寒菌更有效

D:它可以用于治疗伤寒病人

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答案(点此获取答案解析)

D

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    My transportation was unexpectedly smooth and I arrived at the meeting half an hour earlier. I kept my eyes on the restaurant door. Several customers entered, but not my friend. At 6:00 pm, she sent me a text message:“Urgent work to finish. Will be 20 minutes late.”

I had left my book in the office, so I spent the time thinking of my experiences of being late in China. On my first visit in 1985, punctuality was deeply rooted in the Chinese hearts. There were no traffic jams then.

    As a teacher in Canada, I always insisted on punctuality. I would open the classroom door to a late student for the first time and the second, but not the third. During the six years I worked for CCTV, I had a Chinese friend whom I often saw at lunch time, or after work. We used to meet at the subway station nearby. He was always late by 10-20 minutes. To myquestion, “You were busy?” he would surprisingly answer, “ No.” Once I asked him to check the clock in his office, he smiled.

    In March 2015, I got permanent residence (居住权) in China.The ceremony was scheduled for 9:00 am at the Public Security Bureau on the Second Ring Road. I told my driver I had to get there by 8: 40 am. “No problem,”he replied. But he thought he had time to drop someone off at the airport before picking me up. I desperately waited for him. Then, to rub salt into my wound, he had to stop at the exit of a gas station. Finally, I entered the room at 9:07 am ── the last guest to arrive!