牙周病的始动因素是（） A.遗传因素 B.牙菌斑 C.牙石 D.牙合创伤 E.内分泌

已知等腰三角形的一个角为75°，则其顶角为 [ ]

A.30°

B.75°

C.105°

D.30°或75°

已知向量p=（a+c，b），q=（a-c，b-a）且p·q=0，其中角A、B、C是△ABC的内角，a、b、c分别是角A、B、C的对边。

（1）求角C的大小；

（2）求sinA+cosB的取值范围。

依据道路交通安全法律、法规和国家有关政策，制定道路交通安全管理规划，并组织实施的部门是（）。

A.交通部门

B.县级以上地方各级人民政府

C.公安交通管理部门

To Chinese immigrants, in the mid-1800s, California was “The Land of the Golden Mountain.” In their homeland they had heard the words, “There’s gold in California.” They sailed 7,000miles to join the gold rush and strike it rich. Between 1849 and 1882, more than 30,000 Chinese came to California. Most were men. They had been farmers in China. They came here to be miners and laborers. They ended up doing many other jobs, too.

Like many other immigrants, they did not plan to stay in America. They came because of their ties to their homeland and their families. They planned to return to China with their fortunes and help their families.

Only a few Chinese gold miners struck it rich. Most picked over the areas that had been mined already. But still, white miners resented the Chinese. Slowly, they drove the “yellow peril” from the mining camps.

By the end of the 1850s, many Chinese returned home. Those who stayed found other jobs.

Few women had come west in the gold rush. The Chinese saw a good business opportunity. They began doing the jobs women would have done. Many became house servants. Many more opened  laundries.

The Chinese opened restaurants. Chop suey and show mein are popular Chinese-American dishes. The Chinese probably created these dishes to serve to the white miners.

Other Chinese became fishermen, farmers, and even cigar makers.

1. Why did Chinese go to America in the mid-1800s?

A. Because they could find good jobs there.   B. Because they had found gold there.

C. Because they could open laundries and restaurants there.

2. The underlined word “resented” mean “________”.  

A. liked                        B. helped               C. hated                    D. served

3. Which should be the title of the passage?

A. Early Chinese immigrants in America     B. Dream to strike it rich

C. The difference between men and women   D. Gold miners in America

社会下层人士具有模仿社会上层人士的倾向，这是塔尔德所称的（）。

A．上升率

B．先内后外率

C．下降率

D．先外后内率