运行交接班中的“二查”、“三交代”、“五清楚”各指什么？

Which one of the following was used to determine the structure of the DNA molecule ( )

A．Transmission(透射) electron microscope

B．Scanning electron microscope

C．Differential centrifugatioin(差速离心)

D．X-ray crystallography

提高劳动生产率可以增加单位时间内生产的商品数量和价值量。

"It’s no use, Mum," said Johnny. "I’m just no good at dancing."

"You’ve got to keep trying. Tonight will be (1) , dear. Try a turn with that pretty Lisette. "

Johnny (2) . Every Saturday night used to be the best of the week. He and his parents went to the (3) at the Club, where his hero, Alcide, played the accordion with the band. But lately everything had changed. Now that Johnny was older, he was (4) to dance with a girl!

(5) Johnny and his parents arrived at the Club, music had already started. Johnny got up his (6) to approach Lisette. "May I have this dance" Johnny asked. "That’s all right."said Lisette. Johnny struggled to keep up with Lisette’s (7) steps, but he was always one beat behind her. Then Johnny heard his friend Pierre say, "Look! Johnny has two left feet!" (8) burst from the crowd. Johnny (9) and ran outside, determined never to go to another dance.

The next Saturday, Alcide (10) to Johnny’s house for some potatoes. He happened to hear Johnny playing the accordion. Alcide’s eyes (11) . "Bring that accordion and play some songs tonight," Alcide said. Then he drove off, leaving Johnny staring open mouthed (12) him.

At the Club, Johnny scanned the crowd for Lisette and (13) her. The band played for a long time before Alcide said, "Dear friends, I got a (14) for you tonight. Young Johnny is going to join us!" (15) , Johnny stepped up on the platform, his eyes on the floor. He began to play, and the band (16) behind him. When the song ended, he heard cheers. Johnny kept playing until the dance was (17) . "You did a fine job tonight. Play with us again next Saturday night, " Alcide said. "Yes, sir! " said Johnny. (18) he went outside, Johnny saw Lisette and her friends near the door. Lisette stepped (19) , smiling. "You played really good tonight!" she said."Thank you," Johnny blushed. As he walked on, Pierre (20) moved out of the way for him to pass.Johnny patted his accordion. Come to think of it, in his whole life, he had never once seen Alcide out on the dance floor.

3().

A．platform

B．appointment

C．meeting

D．dance

女性，52岁，高中文化，已婚，退休工人。
主诉：失眠，情绪低落2个月，伴有轻生念头两周。(由丈夫和弟弟陪来。)
自述：我退休快一年了，开始感觉还好。后来就觉得无聊，烦躁。总想打电话给丈夫又怕影响他工作，儿子在大学读研究生也很忙。晚上睡不着，经常早醒。白天心情也越来越差，对什么事都没兴趣。记性也越来越差，连做饭都会忘放调料。我越想越觉得自己没用，再这样下去会害了丈夫和儿子的，所以，我就想死了算了(哭泣)。
丈夫反应：妻子工作认真，是厂里的劳动模范。9个月前退休后在家，开始时情况是很好的，很愿意做家务。可是，2个月前我发现她好像有心事，整天闷闷不乐的，做事没有精神，说话反应慢。晚上睡觉时老翻来覆去睡不好，早上早早就醒。曾去医院就诊，做相关检查都正常，医生说她是“失眠症”，与更年期有关，配了些安定，吃了药后睡眠好了些，看上去精神也好了一点。但近1个月来我看她越来越瘦，吃饭没胃口，说胸口被东西堵牢了，人也瘦了好几斤。每天除了做饭就在床上躺着，电视也不看。这两周来，特别厉害，连饭也不做了，还说生活没意思。今天早上我回来拿忘了带的东西，发现她正在系绳子要上吊……我就带她来了。
其他资料：求助者病前工作认真，做事力求完美，能力好，是劳动模范。性格偏内向，人际关系好。

求助者问题可能的社会性诱因是( )。

A．人际关系不良

B．生活环境改变

C．社会文化改变

D．生活环境艰苦

表达式8&3的结果是 【14】 。