[填空题]All key parameters of an alliance relationship have to be planned comprehensively.

[单项选择]HAV是
A. 脊髓灰质炎病毒
B. 甲型肝炎病毒
C. 流行性乙型脑炎病毒
D. 丙型肝炎病毒
E. 人类免疫缺陷病毒

[填空题]All the key words in the article are printed in bold type ______ (以便吸引读者的注意).

[单项选择]HAV的主要传播途径是
A. 虫媒传播
B. 输血传播
C. 呼吸道传播
D. 消化道传播
E. 直接接触传播

[单项选择]对HAV的错误叙述是
A. 为单股正链RNA病毒
B. 能在组织培养中增殖并传代
C. 在潜伏期末和急性期初
D. 患者粪便和血液均有传染性
E. 一般不转为慢性

[填空题]Bear populations have decreased because humans have overhunted hears and occupied their habitat.

[简答题]The History of Chinese Americans
Chinese have been in the United States for almost two hundred years. In fact, the Chinese had business relations with Hawaii prior to relations with the mainland when Hawaii was not yet part of the United States. But United States investments controlled the capital of Hawaii at that time. In 1788, a ship sailed from Guangzhou to Hawaii. Most of the crewmen were Chinese. They were considered the pioneers of Hawaii. The Immigration Commission reported that the first Chinese arrived in the United States in 1820, eight in 1830 and seven hundred and eighty in 1850. The Chinese population gradually increased and reached 64,199 in 1870.
For many years it was common in the United States to associate Chinese Americans with restaurants and laundries. People did not realize that the Chinese had been driven into these occupations by the prejudice and discrimination that faced them in this country.
The first Chinese to r