The reason ________ he refused to attend the meeting was that they didn’t give him an invitation earlier.
| A．how | B．which | C．why | D．because |
181. In the hospital, there are a lot of _____.
| A．ladies doctors | B．lady doctors | C．ladies doctor | D．woman doctors |
180. There is a _____ of understanding between them. Otherwise, they will be good friends.
| A．sufficiency | B．abundance | C．adequacy | D．Lack |
179. In China, the majority of men earn their living by manual ______.
| A．labour | B．task | C．job | D．Work |
178. There are four basic _____ of blood in the human body. What do you belong to, A, B, AB or O?
| A．kinds | B．sorts | C．types | D．Classes |
177. You should turn to Mrs. Green. She is the key figure in the company. The underlined part probably means _____.
| A．a person who has the key | B．a very important person |
| C．a new product__________ | D．a new policeman |