Guaninewasfirstisolatedfromguano,whichis________ manure.
A: chicken
B: cow
C: elephant
D: ird
A: chicken
B: cow
C: elephant
D: ird
举一反三
- There is ______ elephant in the zoo. ______ elephant is from Africa. A: a, The B: an, The C: /, An D: a, An
- as free as a ( ) A: hornet B: owl C: goose D: ird
- People used to put the raw manure back on the lands as fertilizer.
- There are many ______ grazing in the field. A: cows and sheeps B: cow and sheep C: cows and sheep D: cow and sheeps
- -Are those_____________? －No,they aren't. They're______________. A: sheep; cows B: sheep;cow C: sheeps;cow D: sheeps;cows