单项选择题
A. throwing stones often caused injuries B. throwing stones was not fun C. games with stones did not have rules D. rocks were too heavy to throw
A. It hires women with families. B. It has some overseas branches. C. It provides consulting services. D. It encourages the staff to work at home.
A. to avoid being eaten by arctic animals B. because fertilizer is not readily available C. to minimize exposure to the cold D. because unfrozen water supplies are very scarce