业务集中的网元组成环形网采用（）保护方式比较合适。

阅读理解。

    The star of the Harry Potter films has become the youngest person to earn a place on the list of Britain's

richest people. Daniel Radcliffe has owned 14 million pounds, but he is only 17 now.

    Thanks to the ongoing Harry Potter films, Daniel Radcliffe would not have to worry about money for a

very long time. He is still at school but he will never have to work in future. Money has been pouring into

his company.

    The youngest woman on the list is the singer Joss Stone. The 19-year-old singer has collected a fortune

of about 6 million pounds.

1. Daniel Radcliffe is _____. [ ]

A. an actor

B. a student

C. an actor and student

D. a boss and student

2. Joss Stone is _____. [ ]

A. the richest person

B. the riches singer

C. the youngest singer

D. the youngest woman

3. The underlined part "on the list" means _____ in Chinese. [ ]

A. 在表格上

B. 在排名榜上

C. 在电影界

D. 在艺术界

57. --- Would you like some wine?

--- Yes. Just      .   

A．little

B．very little

C．a little

D．little bit

以下说法正确的是：（选对I个得2分，选对2个得4分，选对3个得6分；每选错1个扣3分，最低得分为0分）。

A．当分子间距离增大时，分子势能可能增大

B．已知某物质的摩尔质量为M，密度为ρ，阿伏加德罗常数为N_A，则该种物质的分子体积为V₀＝

C．自然界一切过程能量都是守恒的，符合能量守恒定律的宏观过程都能自然发生

D．布朗运动并不是分子的运动，但间接证明了分子在永不停息的做无规则运动E．一定质量的理想气体，压强不变，体积增大，分子平均动能增加

老年患者，呼吸困难，胸痛，上腹部不适，呕吐。X线胸片示：左侧膈肌明显升高至第3～4前肋水平，心脏向右移位，透视膈肌有矛盾运动，最可能的诊断是()

A．膈疝

B．肺下积液

C．膈膨升

D．肺不张

E．膈下脓肿

下列关于线性表叙述中不正确的是( )。

A．可以有几个节点没有前件

B．只有一个终端节点，无后件

C．除根节点和终端节点外，其他节点都有且只有一个前件，也有且只有一个后件

D．线性表可以没有数据元素