问题 填空题

蝙蝠采用______的方法,可以确定目标的位置和距离,根据这一原理,科学家发明了______,利用这一系统,人们可以探知海洋的深度.

答案

蝙蝠是利用发射和接受超声波,即回声定位的方法来确定目标的位置和距离的,根据回声定位的原理,科学家们发明了声呐.

故答案为:回声定位;声呐.

阅读理解

阅读理解

                                                           BUS SERVICE

                                           New York City-Brennan, New Jersey

                                               (Trip time: 30 minutes each way)

                                                              Timetable

* Buses leave the Railway Station, New York7:00 a.m. and every half-hour thereafter (此后) until

  11:3p.m. (7 days a week).

* Buses leave Brennan Station 20 minutes before and after every hour from 6:20 a.m. to 10:40 p.m.

  (7 days a week)

* Evening rush hours (5:00 p.m. to 7:00 p.m.) buses leave the Railway Station, New York every 15

  minutes (Monday-Friday).

* Holidays: buses leave every hour on the hour each direction. All tickets must be bought at Window 12,

   the Railway Station, New York, or at the Brennan Station Window before boarding buses.

1. What time does a bus leave New York for Brennan on Thursdays?

A. 6:30 a.m.  

B. 10:20 a.m.

C. 4:40 p.m.

D. 6:45 p.m.

2. Which is the latest bus you should take from Brennan if you have to arrive at the Railway Station, New York before 4:00 p.m. on Monday?

A. The 3:30 p.m. bus.

B. The 3:20 p.m. bus.

C. The 3:40 p.m. bus.

D. The 3:00 p.m. bus.

3. What time does a bus leave Brennan for New York on Christmas Day?

A. 9:40 a.m.

B. 1:00 p.m.

C. 3:15 p.m.

D. 8:30 a.m.  

问答题 简答题