Mr.Hall understands that___math has always been easy for him,it is not easy for the students
| A．unless |
| B．since |
| C．although |
| D．when |
Liu Yang is ________ first woman astronaut in China who reached ________ space.
| A．不填；the | B．the；不填 |
| C．the；the | D．a；a |
According to ________ People's Daily article, 40% of the lakes in Jiangsu have dried up in ________ past 30 years.
| A．the；a | B．不填；the |
| C．a；the | D．不填；a |
The actress received an award for her ________ to charity work.
| A．addiction | B．devotion |
| C．allowance | D．application |
We need an effective strategy to help children living in ________ poverty to have the opportunity to receive ________ good education.
| A．/；a | B．a；/ |
| C．/；the | D．the；a |
—What does PM2.5 mean?
—It's a professional ________ indicating the condition of air pollution.
| A．term | B．item |
| C．number | D．mark |