my son and i became lost while hiking high in the southern rockies. i immediately went to work with my map and compass to determine where we had gone off course. my son, an electronics engineer, produced from his pack a hand-held global positioning system receiver.
"i know exactly where we are, " he proudly announced, after carefully locking the instrument on four satellites high above the earth and checking his map. "we're on that mountain there!"
notes:
(1) hike v.远足；徒步旅行
(2) rockies n.（美国）落基山脉
(3) compass n.罗盘
(4) go off course 走下了道
(5) electronics n.电子学
exercises:
根据短文选择正确答案：
① why did the mother and son become lost in the southern rockies?
a. because they were hiking.
b. because the rockies were too high.
c. because they were climbing too high.
d. because they had gone off course.
② what's the use of a compass?
a. to determine where people have gone off course.
b. to show people the correct direction.
c. to make people confused about direction.
d. to make people work well
③ what was the son?
a. a mechanic
b. a tourist guide
c. an electronics engineer
。