Lesson 7
5 not __b____ sound made by animals serves as language
A every b each c the whole d the entire
6 we have only to turn to that extraordinary discovery of echo-location in bats to see a case ____a__ the voice plays a strictly utilitarian role
A which b where c when d though
7 __c____ he shout in the vicinity of a wall, an echo will come back.
A should b if c when d though
8 ___d___ the echo-sounding apparatus was born.
A such b the way c that's how d like thi
5 not __b____ sound made by animals serves as language
A every b each c the whole d the entire
6 we have only to turn to that extraordinary discovery of echo-location in bats to see a case ____a__ the voice plays a strictly utilitarian role
A which b where c when d though
7 __c____ he shout in the vicinity of a wall, an echo will come back.
A should b if c when d though
8 ___d___ the echo-sounding apparatus was born.
A such b the way c that's how d like thi