A.appearance | B.size |
C.behavior | D.change |
A.the insects smell terrible |
B.the experiment will last long |
C.The researchers will probably suffer |
D.the researchers have to study lots of documents. |
A.They are not bloodsuckers. |
B.They are afraid of stockings. |
C.They have a poor sense of smell. |
D.They are protective of their hosts. |
A.looks very promising |
B.has saved millions of lives |
C.is facing great difficulties |
D.is quite simple to carry out. |