缺词填空:R0b2c,D(x']/I
Bats（蝙蝠） are the only flying “animals” in the world. It is known to all that they cannot see very well. “As b_0N(|-O.~_as a bat” is often h_9p4e)d,w.^;p.m;O,_7X.B7c . Yet, they have no trouble flying on the d_8A,N;x,e;j_nights and finding their way r_9V'`1d5h5c_very well. Why can bats fly and see at night? They fly by “radar（雷达）”. The bat's radar w__-Y*y*S/j6Q;`){1x(o2q.v0g+v3W_the same way as the radar on ships and planes. As a bat flies t_7p,g-C'p2s7c3i_the air, it makes a sound. If the sounds hit t_9n'`+A'c)E7`_, they will come back and the bat's e_6?8p2r8v.[)b-k/R_will receive the message. In this way, the bat is a_5d)D.o4L_to know where the things are. Bats go out for f_9@*C.X,F*j(G8e_ at night. In the daytime, they hang in some dark places.:R0b2c,D(x']/I