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Mr. Peter Johnson, aged twenty-three, battled for half an hour to escape from his trapped car yesterday when it landed upside down in three feet of water. Mr. Johnson took the only escape route—through the boot(行李箱). Mr. Johnson’s car had finished up in a ditch(沟渠) at Romney Marsin, Kent after skidding on ice and hitting a bank. “Fortunately, the water began to come in only slowly,” Mr. Johnson said. “I couldn’t force the doors because they were jammed against the walls of the ditch and dared not open the windows because I knew water would come flooding in.” Mr. Johnson, a sweet salesman of Sitting Home, Kent, first tried to attract the attention of other motorists by sounding the horn and hammering on the roof and boot. Then he began his struggle to escape. Later he said, “It was really a half penny that saved my life. It was the only coin I had in my pocket and I used it to unscrew the back seat to get into the boot. I hammered desperately with a hammer trying to make someone hear, but no help came.” It took ten minutes to unscrew the seat, and a further five minutes to clear the sweet samples from the boot. Then Mr. Johnson found a wrench and began to work on the boot lock. Fifteen minutes passed by. “It was the only chance I had. Finally it gave , but as soon as I moved the boot lid, the water and mud poured in. I forced the lid down into the mud and scrambled clear as the car filled up.” His hands and arms cut and bruised(擦伤), Mr. Johnson got to Beckett Farm nearby, where he was looked after by the farmer’s wife, Mrs. Lucy Bates. Huddled in a blanket, he said, “That thirty minutes seemed like hours.” Only the tips of the car wheels were visible, police said last night. The vehicle had sunk into two feet of mud at the bottom of the ditch. 小题1:What is the best title for this newspaper article? A.The Story of Mr. Johnson, A Sweet Salesman B.Car Boot Can Serve As The Best Escape Route C.Driver Escapes Through Car Boot D.The Driver Survived A Terrible Car Accident 小题2:Which of the following objects is the most important to Mr. Johnson? A.The hammer. B.The coin. C.The screw. D.The horn. 小题3:Which statement is true according to the passage? A.Mr. Johnson’s car stood on its boot as it fell down. B.Mr. Johnson could not escape from the door because it was full of sweet jam. C.Mr. Johnson’s car accident was partly due to the slippery road. D.Mr. Johnson struggled in the pouring mud as he unscrewed the back seat. 小题4:“Finally it gave” (Paragraph 5) means that _______. A.Luckily the door was torn away in the end B.At last the wrench went broken C.The lock came open after all his efforts D.The chance was lost at the last minute 小题5:It may be inferred from the passage that _______. A.the ditch was along a quiet country road B.the accident happened on a clear warm day C.the police helped Mr. Johnson get out of the ditch D.Mr. Johnson had a tender wife and was well attended
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【多选题】下列关于四环素的描述,正确的是( )。
A.
pH<2时,发生脱水反应< /div>
B.
PH2~6时,发生脱水反应
C.
PH>7.5时,发生降解反应
D.
PH2~6时,发生差向异构化反应
E.
PH>7.5时,发生开环反应
【单选题】一个阻值为0.5Ω电动势为3V的电源,给一个电阻R供电,已知端电压为2V,则电路中的电流及电阻R的阻值分别是( )
A.
6A;3Ω
B.
4A;4Ω
C.
2A;4Ω
D.
2A;1Ω
【单选题】一个阻值为0.5 Ω电动势为3V的电源,给一个电阻R供电,已知路端电压的大小是2.5V,则电阻R的大小是( )
A.
B.
2.5Ω
C.
0.5Ω
D.
25Ω
【多选题】下列关于四环素的描述,正确的是( )。
A.
pH<2时,发生脱水反应< /div>
B.
PH>7.5时,发生降解反应
C.
PH2~6时,发生脱水反应
D.
PH2~6时,发生差向异构化反应
E.
PH>7.5时,发生开环反应
【判断题】有极性电容器管脚长短可用来区分电容正负极,其中长脚为正,短脚为负。
A.
正确
B.
错误
【多选题】下列关于四环素的描述,正确的是()
A.
pH<2时,发生脱水反应< /div>
B.
pH2~6时,发生脱水反应
C.
pH>7.5,发生降解反应
D.
pH2~6时,发生差向异构化反应
E.
pH>7.5,发生开环反应
【单选题】一个阻值为0.5 Ω电动势为3V的电源,给一个电阻R供电,已知电路中的电流是0.4A,则电阻R的大小是( )
A.
7.5Ω
B.
C.
2.8Ω
D.
0.2Ω
【判断题】在各种资金来源中,凡是需支付固定性资本成本的资金都能产生财务杠
A.
正确
B.
错误
【单选题】以下关于四环素的描述哪一个是正确的
A.
抗菌谱窄,只对革兰氏阳性菌有抑制作用
B.
食物尤其是乳制品或同服碳酸氢钠等抗酸药均可影响其吸收
C.
适合各种人群使用,包括孕妇及8岁以下的儿童
D.
长期使用不会造成二重感染等不良反应
【多选题】下列关于四环素的描述,正确的是( )。
A.
pH<2时,发生脱水反应< /div>
B.
pH2-6时,发生脱水反应
C.
pH>7.5时,发生降解反应
D.
pH2-6时,发生差向异构化反应
E.
pH>7.5时,发生开环反应
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【多选题】下列关于四环素的描述,正确的是( )。
【多选题】下列关于四环素的描述,正确的是( )。
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