单项选择题
A．They grow up to be funny and charming. B．They often have a poor sense of direction. C．They get less attention from their parents. D．They tend to be smart and strong-willed.
A．It is harmful to heart surgery patients with stomach bleeding. B．It should not be taken by heart surgery patients before the operation. C．It will have considerable side effects if taken in large doses. D．It should not be given to patients immediately after the operation.
A．It can help solve complex problems. B．It will most likely prove ineffective. C．It is a new weapon against terrorists. D．It will help detect all kinds of liars.