South Carolina’s mineral resources are abundant, but not all of them can be lucratively mined.

单项选择题The ship left New York on her maiden voyage.

单项选择题When the United States stock market fell in 1929, many stockholders were forced to sell their shares at ludicrously low prices.

单项选择题In 1845 Sarah Mather invented a submarine telescope that could be used to locate and study underwater objects.

单项选择题Frostbitten fingers and toes should be treated with lukewarm water.

单项选择题Youth hostels provide inexpensive lodging for young people throughout the United States and in other countries.