单项选择题
A. of B. like C. as D. for
A. Let all condors free. B. Don’t allow anyone to hunt. C. Make hunters use different kinds of bullets. D. Move the condors out of California.
A. accuracy in speed measurement is essential to spaceships B. the speeds of space vehicles will vary C. inaccuracies in measurement could cause accidents in space missions D. a bump could affect the preciseness of the laser-doppler radar