多项选择题

Outline:

A. My general vision on what China will be like in 2050;
B. Changes to be expected in different aspects in 2050;
C. The social value and well being to be brought about by the changes.

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单项选择题

Why do athletes often go to high altitudes to train

A．Because they want to increase the amount of haemoglobin in their bodies.
B．Because it may help reduce the amount of red blood cells in their bodies.
C．Because they intend to learn more from the mountain dwellers.
D．Because it can help them to adapt themselves to the high altitud

单项选择题

Which of the following is a feature that the hammerhead shark shares with other sharks

A．They have slender bodies.
B．They have wide lobes.
C．They use electroreceptors to detect prey.
D．They sense electric fields from far away.