Scientists say it may be five or ten years___________ it is possible to test this medicine on human patients.
| A．since | B．before | C．after | D．when |
---- Shall I give you a ride as you live so far away?
----- Thank you. ___________.
| A．It couldn’t be better. | B．Of course you can | C．If you like | D．It’s up to you. |
Great changes_______ in the rural areas in the last two decades.
| A．have taken place | B．took place | C．have been taken place | D．are happening |
4. The purpose of her study was to .
| A．watch the wild chimps in cages | B．gain a doctor’s degree |
| C．understand and respect the lives of chimps | D．live in the forest as men can |
3. Jane was permitted to begin her work after .
| A．the chimp family woke up | B．she lived in the forest |
| C．her mother came to support her | D．she arrived at Gombe |
2. Why did Jane go to Africa to study chimps in the wild? Because she wanted .
| A．to work with them in their own environment | |
| B．to prove the way people think about chimps was wrong | |
| C．to discover what chimps eat | D．to observe a chimp family |