[填空题]Requests for paternity tests (亲子鉴定) by Chinese men（）(increase) in recent years.

[填空题]Requests for paternity tests (亲子鉴定) by Chinese men ______ (increase) in recent years.

[单项选择]DNA是人类进行亲子鉴定的主要依据。就DNA的组成，下面说法正确的是( )。
A. DNA由核糖、碱基和磷酸组成
B. DNA由脱氧核糖、磷酸和碱基组成
C. DNA由脱氧核糖、磷酸、碱基和蛋白质组成
D. DNA由脱氧核糖、磷酸、碱基和脂肪组成

[单项选择]DNA指纹法应用于亲子鉴定和法医学中疑犯的判定等。下列哪项对DNA指纹法的叙述最准确
A. 从血液、皮肤或精液可分离出DNA，并分析其从串联重复产生的不同的限制性片段谱
B. 从血液、皮肤或精液分离出DNA，用凝胶电泳分析其片段分布
C. 从血液、皮肤或精液的，RNA 以反转录酶拷贝出其DNA，分析其互补DNA谱
D. 从血液、皮肤或精液分离出DNA，用HLA探针杂交以观察HLA基因谱
E. 从血液、皮肤或精液分离出DNA，再离心分离出卫星DNA作凝胶电泳分析

[单项选择]
Men who exercise often are less likely to die from cancer than those who (51) , new research published in the British Journal of Cancer revealed yesterday.
A team of scientists from the Karolinska Institute in Sweden looked (52) the effect of physical activity and cancer risk in 40,708 men (53) between 45 and 79.
The seven-year study found that men (54) walked or cycled for at least 80 minutes a day had a 84 percent lower risk of (55) from cancer than the men who did less exercise or nothing at all. (56) the period studied, 3,714 men developed cancer and 1,153 died from the disease. The researchers suggest that half an hour’s walking (57) cycling a day increased survival among these men by 33 percent.
The researchers surveyed men from two counties in central Sweden about their lifestyle and the amount of (58) activity t
A. don’t
B. didn’t
C. won’t
D. can’t

[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

[填空题] Chinese Americans
Chinese Americans are an ethnic minority in the
US. They used to be discriminated.
1. The history of Chinese immigrants
1) The first group of Chinese arrived during the
California (1) ______ in 1849. Their success invited (1)______
envy. They had to earn a living by doing the (2)______ (2)______
for the white miners, setting up restaurants, working as
farmhands or as (3) (3)______
2) The second group of Chinese arrived in the
early (4)______as laborers to construct the (4)______
(5)______ (5)______
3) After World War Two, more Chinese
were permitted to settle in America.
4) Today’s Chinese Americans are mostly the (6) (6) ______
______ of the first two groups of immigrants.
2. Some of their noteworthy characteristics as part
of their traditional culture
1) (7)______family ties (7) ______