治疗变异型心绞痛疗效最佳的是：A．硝苯地平 B．氟桂嗪 C．尼莫地平 D．维拉帕米

This text is ____ of the two. [ ]

A. more difficult

B. difficult

C. the more difficult

D. the most difficult

Most people agree that the direct, assertive(过分自信的) American personality is a virtue, but it sometimes surprises foreigners. In many cultures, respect for older people or those in positions of authority keeps others from expressing their true feelings. But in the U.S, children often argue with their parents, students may disagree with their teachers, and citizens may express opposition to the actions of the government. If the soup has a fly in it or the meat is too tough to chew, the diner can complain to the waiter, if the boss makes a mistake, an employee will politely point it out.

Some straight talk about the American character must include the admission that Americans have their faults. The extremely competitive nature of Americans is probably their worst fault. Of course, competition isn’t always bad. As a matter of fact, it promotes excellence by encouraging individuals and businesses to try to do their best. But the desire to get ahead of others sometimes causes people to do things that are unkind and even dishonest. Also, Americans admire what is practical, fast, efficient, and fresh. Sometimes they fail to understand and appreciate practices that have greater respect for more traditional, leisurely ways of doing things. On the other hand, people from other cultures may dislike the practical, challenging American lifestyle.

Despite culture differences, most foreigners give Americans credit for their virtues. Americans are generally viewed as friendly, adaptable, energetic, and kindhearted. Most newcomers to the U.S. like Americans, and the feeling is usually mutual. Perhaps the greatest American virtue is a deep interest in new ideas and new people. In a nation of immigrants, the foreigner does not remain an outsider for long.

73．Find a word in the last paragraph closest in meaning to the underlined word immigrant?

74.Why is the extremely competitive nature considered as one of American faults?（不超过10个词）

75.What does the passage mainly talks about? （不超过2个词）

配置DHCP服务器IP地址池的地址为193.45.98.0/24，其中193.45.98.10～193.45.98.30用做静态地址分配，正确的配置语句是（）。

A．ip dhcp excluded-address 193.45.98.10.193.45.98.30
network 193.45.98.0 255.255.255.0

B．ip dhcp excluded-address 193.45.98.10.193.45.98.30
network 193.45.98.0/24

C．ip dhcp excluded-address 193.45.98.10 193.45.98.30
network 193.45.98.0 0.0.0.255

D．ip dhcp excluded-address 193.45.98.10 193.45.98.30
network 193.45.98.0 255.255.255.0

企业经营环境

下面制品保存或制备温度错误的是（）

A.冰冻红细胞置-65℃以下保存

B.冰冻红细胞的解冻应在37℃～41℃

C.虹吸法制冷沉淀凝血因子应在4±2℃环境下进行

D.在进行白细胞过滤时，如果血液已经处于保存温度（4±2℃），需要在室温进行过滤时，室温应≤26℃