单项选择题

Left-handers seem more athletic because they（）

A．are more energetic.
B．persist in physical training.
C．possess a creative impulse.
D．have a better sense of space.

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As the pathway is used repetitiously, the surrounding cells become larger and more tightly wrapped around the electrically conductive pathways, thereby transforming the memory from a short-term memory to a long-term memory.
单项选择题
Which of the following is responsible for the inflammation of the joints（）

A．A special molecule on cell' s surface.
B．A free-floating receptor.
C．A tumor-killing protein.
D．Inactive TNF.
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