培养细菌常用的培养基可分为、厌氧培养基五种。

下列句子中加点成语使用正确的一项是   

A．在建立导弹防御系统问题上，美德两国首鼠两端，很快达成了一致意见。

B．由美国次贷危机引发的金融风暴，以风卷残云之势在两周内迅速蔓延到世界各地，其影响之大让人始料不及。

C．孙犁在“ * * ”后至1995年写成的《耕堂劫后十种》，在思想性与艺术性上有较大的突破，是散文界的空谷足音。

D．中国古典山水诗平淡而隽永，读者透过优雅的意象想像其中的画面和情景，就能领悟意境的含英咀华和美妙深远。

有关血琼脂平板，叙述错误的是（）

A.常用血液为羊血

B.血液灭菌后才能加入培养基中

C.血液含量一般为10%左右

D.琼脂含量为2%～3%

E.属于营养培养基

阅读理解

                                                        Crossing the Rubicon

     The march to Italy was began.The soldiers were even more enthusiastic than Caesar (恺撒) himself.

They climbed mountains,  waded rivers,  endured tiredness,  and faced all kinds of danger for the sake

of their great leader.

     At last they came to a little river called the Rubicon (卢比孔河). It was the boundary line of Caesar's

Province of Gaul;  on the other side of it was Italy.Caesar paused a moment on the bank.He knew that

to cross it would be to declare war against Pompey and the Roman Senate;  it would involve all Rome in

a fearful battle,  the end of which no man could foresee.

     But he did not hesitate long.He gave the word,  and rode boldly across the shallow stream.

     "We have crossed the Rubicon,  " he cried as he reached the farther shore."There is now no turning

back." Soon the news was carried to Rome "Caesar has crossed the Rubicon" and there was great fear

among those who had planned to destroy him.Pompey's soldiers deserted him and hurried to join

themselves to Caesar's army.The Rome senators and their friends made ready to escape from the city.

     "Caesar has crossed the Rubicon!" was shouted along the roads and byways leading to Rome;  and

the country people turned out to meet and hail with joy the conquering hero.

     The word was carried a second time to the city "Caesar has crossed the Rubicon" and the wild fight

began.Senators and public officers left everything behind and hurried away to seek safety with Pompey.

On foot,  on horseback,  in litters,  in carriages,  they fled for their lives-all because Caesar had crossed

the Rubicon.Pompey was unable to protect them.He hurried to the seacoast,  and,  with all who were

able to accompany him,  sailed away to Greece.

     Caesar was the master of Rome.

1. Which of the following can NOT be used to describe Caesar's army?

A. Enthusiastic in the march.

B. Not afraid of tiredness.

C. Brave in the march.

D. Eager to be great leaders.

2.  According to the passage,  crossing the Rubicon meant all of the following EXCEPT that______.

A. Caesar declared war against Pompey and the Roman Senate

B. Caesar would involve all Rome in the battle

C. Caesar would be defeated in the war

D. Caesar was determined to carry out the battle

3. What happened when the news was first carried to Rome that Caesar had crossed the Rubicon?

A. The people who had been against Caesar felt very frightened.

B. The people who had turned traitor to Caesar were wild with joy.

C. The public officers and soldiers fought bravely against Caesar.

D. The Rome senators and their friends had already escaped.

4. What did Pompey do after Caesar crossed the Rubicon?

A. He rode to the bank of the Rubicon hurriedly.

B. He fled to Greece by sea with all his companions.

C. He had all his relatives and soldiers stay with him.

D. He kept calm and stayed in Rome,  defeating his enemies.

一般要求停止抽真空后，30分钟内系统的真空度下降不大于（），可认为合格。

A、500Pa

B、1000Pa

C、1500Pa

D、2000Pa