小儿回春丹2功效与作用

图表示地球表面沿某经线山地雪线高度随纬度变化。读图回答下列各题。

小题1:A点所在地区陆地水平自然带最有可能是

A．热带雨林带

B．热带荒漠带

C．温带落叶阔叶林带

D．亚寒带针叶林带小题2:图中A地与B地相比

A．纬度低

B．降水多

C．海拔低

D．光照强

通常简称为“两税一费”的，并不包括( )。

A．营业税

B．所得税

C．城市维护建设税

D．教育费附加

Man, a land animal. But he is also closely tied to the sea. Throughout history the sea has served the needs of man. The sea has provided man with food and a convenient way to travel to many parts of the world. Today, nearly two-thirds of the world’s population live within 80 kilometers of the sea coast.

In the modern technological world, the sea offers many resources to help mankind survive. Resources on land are beginning to be used up. The sea, however, still can be hoped to supply many of man’s needs.

The list of riches of the sea yet to be developed by man’s technology is big. Oil and gas explorations have been carried out for nearly 30 years. Valuable amounts of minerals exist on the ocean floor ready to be mined.

Fish farming promises to be a good way to produce large quantities of food. The culture of fish and shellfish (贝类动物) is an ancient skill practised in the past mainly by Oriental people, including people in China.

Besides oil and gas, the sea may offer new sources of energy. Experts believe that the warm temperature of the ocean can be used in a way similar to the steam in a steamship. Ocean currents and waves offer possible use as a source of energy.

Technology is enabling man to explore ever more deeply under the sea. The development of strong, new materials has made this possible.

The technology to harvest the sea continues to improve. Experts believe that by the year 2020 the problems that prevent us from exploiting（开发） fully the food, minerals, and energy sources of the sea will be largely solved.

小题1:The major things that the sea offers man are ______.

A．fish and oil

B．minerals and oil

C．warm temperature and ocean currents

D．the food, energy sources, and minerals小题2:We can conclude from this passage that ______.

A．the sea resources have largely been used up

B．the sea, in the broad sense, has not yet been developed

C．the problems that prevent us from using the food, minerals, and energy sources of the sea have already been solved.

D．by the year 2020, the technology will be good enough to exploit all the sea resources小题3:The underlined words “Oriental people” in the fourth paragraph probably mean ______.

A．the people in Asia

B．African people

C．European people

D．American people小题4:The best title for this passage is ______.

A．Sea Harvest

B．Sea Food

C．Technology for Exploiting the Sea

D．Man and the Sea

¹⁸F-FDGPET心肌代谢显像的描述不正确的是（）。

A.糖尿病患者，注射示踪剂前应保持适当的、恒定的血糖水平，否则血糖过高，影响¹⁸F-FDG摄取

B.¹⁸F-FDG是葡萄糖的模拟物，可被细胞摄取磷酸化为5-磷酸-葡萄糖，因此可用来研究心肌细胞的葡萄糖代谢情况

C.检测梗死区中存活心肌时，多在空腹下进行

D.¹⁸F-FDGPET显像用于诊断心肌缺血，通常是在葡萄糖负荷情况下进行

E.心肌细胞坏死时，仍然可以利用耗氧比较低的葡萄糖代谢，维持能量需求，因而在图像上表现为摄取减少

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