单项选择题

When did people begin to realize the value of salt

A．When they used salt to melt snow.
B．When they started to preserve food with salt.
C．After they found animals licking salt.
D．After they found salt's magical powers.

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热门试题

单项选择题

What is the problem being talked about for years in America

A．Leaders of political parties.
B．Reforms of social security.
C．Security of American citizens.
D．Improvement of the health security.

单项选择题

According to Paragraph 4, we can see that the author believes that ______.

A．The US is much more advanced in its health care system
B．American people are better at research than other people
C．new medicines are being developed all over the world
D．the newly developed technologies are aimed at curing fatal diseases