问题 单项选择题

与某学校相邻的自来水厂院内有一钢瓶,在搬运过程中钢瓶阀门断裂,导致大量黄绿色、有强烈刺激性气味的气体外泄。泄露的气体随风扩散到该学校,使师生在短时间内出现了明显的眼及上呼吸道刺激症状。

该类气体损伤的病变部位和程度与下列哪项因素关系不大

A.气体的化学结构

B.气体水溶解度

C.气体的浓度

D.气体的接触时间

E.机体的应激能力

答案

参考答案:A

解析: 刺激性气体对机体的损伤程度主要与接触的浓度和时间有关,而刺激性气体损伤部位主要取决于其水溶性,同时机体的应激能力也影响着在相同接触水平下不同个体刺激反应的轻重。但由于刺激性气体的种类繁杂,所以,不可能将其归入某一类化学结构。

单项选择题
单项选择题

"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.

18().

A.As

B.Because

C.Until

D.So