单项选择题
The example of Henry Ford's attitudes towards competition was used to illustrate （）
A．the causes for his successes B．some of his failures C．another part of his personality D．why he was left behind the modem competition
单项选择题 Laser-doppler radar is especially valuable in space missions because （）
单项选择题 Laser-doppler radar（）
单项选择题 Which of the following statements is not true according to the passage （）
