By citing the toothpaste is out of the tube, the author intends to mean that______.
A. a younger generation of unskilled immigrants has been produced and their number will grow
B. the unskilled immigrants have dragged down the wages of the natives and will continue to do so
C. the children of unskilled immigrants have done poorly in school and will likely to drop out soon
D. the unskilled immigrants have already been here and will certainly not return
查看答案
The author cites Mr. Smiths survey in order to show that______.
A. most immigrants are either highly skilled or poorly unskilled
B. immigrants take up a larger proportion of American population than the natives
C. immigrants are mostly those who haven"t received good education in their own countries
D. there are more highly-skilled immigrants in America than unskilled immigrants
女，35岁，有反复关节红肿病史，因活动后心悸、突发呼吸困难及咳粉红色泡沫痰入院。查体：心尖区舒张期隆隆样杂音，双肺布满水泡音。ECG示心动过速，二尖瓣型P波。最可能的诊断是
A. 风心病、二尖瓣狭窄，左房代偿期
B. 风心病，二尖瓣狭窄，左房失代偿期
C. 风心病，二尖瓣狭窄，左心衰竭期
D. 风心病，二尖瓣狭窄，右心衰竭期
E. 风心病，二尖瓣狭窄，全心衰竭期
男，58岁。劳累后心前区闷痛8年，近1周常因夜间胸痛而惊醒，发作时心电图特征为：Ⅱ、Ⅲ、aVF导联ST段呈单向曲线型上抬0.2mV，缓解后上抬消失，发作时最不宜用哪一个药物
A. B受体阻滞剂
B. 卡托普利
C. 硝酸甘油
D. 硝苯地平
E. 丹参制剂
女性，34岁。被车撞伤l小时入院。查体：骨盆挤压和分离试验阳性，下腹部压痛、腹肌紧张。为了排除腹内脏器损伤，以下哪种检查最简单可靠
A. B超
B. CT
C. X线
D. 血常规
E. 腹腔穿刺
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