Other genetic similarities suggested they all ________ a single, common ancestor about 300 years ago.
| A．had | B．have had | C．have | D．had had |
The bald eagle (秃鹰）__________ the United States.
| A．relates |
| B．takes the place of |
| C．represents |
| D．stand for |
In __________ Chinese culture, marriage decisions were of ten made by parents for their children.
| A．traditional | B．historic | C．remote | D．initial |
The __________ on his face told me that he was angry.
| A．impression |
| B．sight |
| C．appearance |
| D．expression |
The palace caught fire three times in the last century, and little of the original building__________ now.
| A．remains |
| B．is remained |
| C．is remaining |
| D．has been remained |
Although medical science __________ control over several dangerous diseases, what worries us is that some of them are returning.
| A．achieved | B．has achieved | C．will achieve | D．had achieved |