All dogs are capable of doing harm to human beings.

单项选择题Human facial expression differ from those of animals in the degree to which they can be deliberately controlled and modified.

单项选择题You don't need to carry large amounts of cash； actually all financial businesses will be con-ducted by computers.

单项选择题What makes a major success in Los Angeles is the strength of his public support.

单项选择题The next morning she told us that the last question didn't depart till well after midnight.

单项选择题The people who speak Esperanto hope that the language someday will become the international language for trade, science, and diplomacy.