圆柱体的侧面展开，将得不到（ ） A．平行四边形 B．梯形 C．正方形 D．长方形

葡萄糖是生命体所需能量的主要来源。

【提出问题】葡萄糖的燃烧产物是CO₂和H₂O，由此能否证明葡萄糖是只由碳元素和氢元素组成的有机物？

【实验设计】为了确定葡萄糖的元素组成，某小组设计了如下实验（其中浓硫酸、无水CaCl₂均为常用干燥剂，部分固定装置省略）。

（1）装置A中发生反应的化学方程式是____________________。

（2）装置B中浓硫酸的作用是__________。

（3）装置C处氧化铜的作用是___________。

【方案评价】（4）用充有空气的储气球代替装置A，是否更有利于实验的进行？_________（填“是”或“否”），原因是___________________。

（5）装置C处葡萄糖燃烧的设计特点是___________（至少1条）。

【数据处理】下表是同学们填写的实验报告，请你帮助完成。

【讨论交流】为了尽量减少误差：

（6）该实验在进行过程中应注意的问题是_________________。（1条）

（7）从定量实验的角度看，该实验是否可进一步改进？请简要写出一个改进意见：_____________。

The USA, New York —Whales and dolphins are facing increasing threats from climate change, according to a new report published by WWF and the Whale and Dolphin Conservation Society（WDCS）.

The report “Whales in hot water?” draws attention to the growing impacts of climate change on whales. They range from changes in sea temperature and the freshening of the seawater because of the melting of ice and increased rainfalls, to a sea level rise, loss of icy polar habitats and the decline of krill populations in key areas. Krill, a tiny shrimp that is dependent on sea ice, is the main source of food for many of the great whales.

The speeding up of climate change adds greatly to trouble from other human activities, such as chemical and noise pollution, which kills some 1000 whales every day.

“Whales and dolphins have an ability to adapt to their changing environment,” said Mark Simmonds, International Director of Science at WDCS. “But the climate is now changing at such a fast pace that it is unclear to what extent whales and dolphins will be able to adjust.”

Climate change impacts are currently greatest in the Arctic and the Antarctic. According to the report, cetaceans that rely on polar, icy waters for their home and food resources are likely to be greatly affected by the reduction of sea ice cover.

WDCS and WWF are urging governments to cut global production of CO2 by at least 50 percent by the middle of this century. The latest report of the Intergovernmental Panel on Climate Change showed it was possible to stop global warming if the world’s emissions start to decline before 2015.

1. From the passage, we can learn that whales mainly feed on ______.

A. dolphins       B.krill         C. sea horses       D. sharks

2. Which of the following has the same meaning as the underlined word “decline” (in Para 2)?

A. produce         B. develop       C. fall         D. increase

3. In what place is climate change greatest?

A. Two polar areas.                       B. Asia.

C. The pacific ocean.                    D. Equator.

4. Which of the following is not true according to the passage?

A. Climate change will lead to the changes in sea temperature.

B. Climate change will result in the freshening of the sea water.

C. Climate change will have a bad effect on human activities and whales.

D. Human beings will forever have no ability to stop global warming

当四格表的周边合计不变时，如果某格子的实际频数有变化，则其理论频数（）

A.不变

B.减小

C.增大

D.随该格子实际频数的增减而增减

E.不确定

破产案件中，未收到通知的债权人申报债权的期限应为自法院公告之日起的：

A．一个月

B．10天

C．三个月

D．15天