【单选题】People are surprised to learn that _______.
A.
Negroes' achievements are not shown in history books
B.
Phillis Wheatley learned English
C.
Negroes are good at mathematics
D.
Negroes have a very long history in America
【单选题】Suppose the price elasticity of supply for candles is 0.3 in the short run and 1.2 in the long run. If an increase in the demand for candles causes the price of candles to increase by 36%, then the q...
A.
0.8% in the short run and 3.3% in the long run.
B.
1.2% in the short run and 0.3% in the long run.
C.
10.8% in the short run and 43.2% in the long run.
D.
120% in the short run and 30% in the long run.
【单选题】One of the facts that reflect the primitiveness of airline industry is ______.
A.
its history is much longer than that of car industry
B.
it is composed of international and domestic carriers
C.
its market is divided by many a relatively small carriers
D.
it is still an industry of comparatively low profits
【简答题】(题干)一群成年番鸭突然发病,病死率在60%以上,临诊表现主要为体温升高、两腿麻痹、排绿色稀粪。剖检见食管黏膜出血、水肿和坏死,并有灰黄色伪膜覆盖或溃疡;泄殖腔黏膜出血;肝有坏死点。该群鸭发生的疾病可能是A.鸭瘟 B.禽流感 C.鸭病毒性肝炎 D.番鸭细小病毒病 E.鸭疫里默氏杆菌病 首选的确诊方法是A.细菌分离 B.病毒分离 C.易感动物接种 D.病理组织学检查 E.ELISA抗体检测 对该群鸭...
【单选题】一群成年番鸭突然发病,病死率在60%以上,临床表现主要为体温升高、两腿麻痹、排绿色稀粪。剖检见食道黏膜出血、水肿和坏死,并有灰黄色伪膜覆盖或溃疡;泄殖腔黏膜出血;肝有坏死点。该群鸭发生的疾病可能是( )