病毒非遗传性变异包括（） A.互补作用 B.加强作用 C.基因重组 D.表型混合 E

什么是计算机病毒简述计算机病毒的特点。

港口与航道工程安全生产要求中，起重作业前必须了解起吊物件的基本情况，如()等，包括施工现场的地形、地貌、水域情况，运输道路及其场地面积等。根据被吊物的特点及周围环境，制订施工方案，在施工方案的内容中，必须制定专门的安全技术措施。

A．被吊物的外形尺寸

B．被吊物的重量

C．被吊物的颜色

D．被吊物的起吊高度

E．被吊物周围环境

阅读理解。

    With its budget of $80 million, John Woo as director, and an all-star cast (明星云集

的演员阵容), Red Cliff is the most expensive and ambitious Asian-financed film ever. Last

week I saw the release of the second part, and boy oh boy does it shows.

    But watching the film as a foreigner I felt I was missing out on something. Not knowing

my Cao Cao's from my Zhou Yu's, I was not even sure whom I wanted to win. Certainly after

the opening scene, in which Cao Cao is seen watching a game of Cuju, an ancient Chinese

variation of football, I knew who had my support. After all, any man who enjoys his

football is someone after my own heart. But after Cao Cao resorted to some evil strategies

against his enemies in the south, I wasn't so sure he was the man I should be rooting for. 

    And there is a lot more to Red Cliff 2 than just extravagant battle scenes. The film

does not take itself too seriously. Conversations between leaders are littered with one-

liners, many of which had the audience in laughter. There is even enough to keep fans of

more romantic entertainment happy too. This includes a charming relationship between a

southern spy (侦探) and an innocent northern soldier. The characters' interaction provides

some genuinely heart-warming moments in the middle of the battle.

    Clocking in at(结束于) around two hours, the film certainly does justice to the

history story. When I walked out the cinema, I felt as drained (精疲力竭) as Cao Cao's

soldiers must have 1,800 years ago.

1. By expressing "boy oh boy" in the first paragraph, the author seems to show that _____.[ ]

A. the film characters are like boys who are childish.

B. the film provides amazing and surprising scenes for audience.

C. the film is suitable for younger boys to watch.

D. the film scene is so bloody that boys shouldn't watch it.

2. When did the author change his attitude toward Cao Cao? [ ]

A. When he read the history story about Cao Cao.

B. When he saw Cao Cao was watching a game of Cuju,

C. When he realized that Cao Cao took some bad measures to beat his enemies.

D. When he saw the romantic love story of Cao Cao and a southern spy.

3. The following factors of the film are all mentioned in the passage except _____. [ ]

A. high budget

B. leading roles

C. actors and actress

D. conversations

4. From the passage we can infer that _____. [ ]

A. the author is a football fan in a foreign country

B. Cuju is the name of an ancient Chinese variation of football

C. the film Red Cliff 2 lasts about two hours

D. the author was very tired after about two hours' battle

下列关于抛补看涨期权的说法，错误的是______。

A．出售抛补看涨期权包括持有股票和出售以股票为基础资产的看涨期权
B．交易策略为“多头股票+空头看涨期权=多头看跌期权”
C．如出售抛补看涨期权，则在股票价格高于执行价格时会损失掉一部分资本利得，但这种策略能保证股票按原计划价格X卖出，所以不失为一种好的方法
D．行权时，如市场价格大于X，该策略收益合计为X

常用的隔离开关有GW4-35和（）两种型号。