航空油料价格的上升时，如果此时航空运价不能得到及时调整，就会使航空运输业利润( )

放射性核素显像技术的叙述，错误的是（）

A.显像剂要求标记方便

B.选择合适的射线能量

C.显像最适宜的能量为小于150keV

D.放射性核素的化学纯度要高

E.选择最佳显像时间

关于气候变化的国际合作，以保障经济发展为核心，以节约能源、优化能源结构、加强生态保护为重点。这个要求体现的哲学道理是（ ）

A．办事情要抓住重点

B．想问题要讲两点论

C．矛盾具有普遍性

D．局部功能大于整体功能

You are a German living in Berlin. One day you’ re walk¬ing down the street, minding your own business, when sudden¬ly a stranger comes up with a smile on his face. After stopping you, he holds a small electronic device (装置) close to his face and speaks slowly into it, saying, in English," Can you tell me where I can buy some sauerkraut?" What should you do? (a) Run away; (b) Call the police; or (c) Listen closely for the device to say in German," Konnen Sie mir bitte sagen, welches sauerkraut haufen kann?"

The most proper answer would be (c) because the person in front of you is only a tourist trying to enjoy himself. The de¬vice is said to be the world’s first portable(便携的) translator — a hand-held microcomputer that at the same time translates one spoken language into another. The four-pound, battery-op¬erated product is called the Voice, and it is the invention of Advanced Products and Technologies, an American electronics company. When the Voice is introduced in the Unite States in late April — at a price of (1,500 — it will be used to trans¬late spoken English into Italian, German, French and Span¬ish. The product comes with separate cartridges(盒式存储器) for each of the four languages, which can be changed when the user travels from one country to another. It will be sold in Eu¬rope soon after the US introduction, with cartridges that trans¬late Italian, German, French and Spanish into English.

The Voice uses a microchip(微型集成电路片) to trans¬late languages. It is Started by voice command and produces voice output through a built-in speaker. When the user makes a statement or asks a question, the Voice immediately repeats what has been said in another language.

1. The device held by the stranger is probably a kind of________.

A. a two-way radio                      B. language translator

C. easily-carried speaker                     D. a multi-functioned computer

2. What does the last sentence of the first paragraph mean?

A. Can you tell me where I can buy some sauerkraut?

B. Can I ask for some information from the police?

C. Would you like to try my device?

D. Would you not run away if I ask you where to buy some sauerkraut?

3. When the stranger says," Can you tell... sauerkraut?" he is ________.

A. learning German from his device

B. asking you the way to the sauerkraut shop

C. making fun of you with his device

D. testing his device for fun

4. Which of the following is not mentioned in the text?

A. The price of the hand-held microcomputer.

B. The function of the product Voice.

C. The producer pf the small electronic device.

D. The number of the device sold to the European coun¬tries.

细胞周期包括分裂间期(分为G₁期、S期和G₂期)和分裂期(M期)。下图标注了甲动物(体细胞染色体数为12)肠上皮细胞的细胞周期各阶段的时长及DNA含量。请回答下列问题：

从被标记的M期细胞开始出现到其所占M期细胞总数的比例达到最大值时，所经历的时间为（）期的时间，处于该期的一个细胞中染色体数目的变化情况是（）

凡作业地点离地面（楼板）以（）上，即为高空作业。

A、2m

B、3m

C、4m

D、1m