题目内容
— Our daughter passed the test yesterday.
— So she did. She for it really hard.
A. had studiedB. will study
C. has studiedD. is studying
A
【解析】
试题分析：句意：我们的女儿昨天通过了考试。- 确实如此，她真地为它而努力学习了。根据句意可知努力学习在通过考试之前，即发生在过去的过去，故用过去完成时，故选A。
考点：考查过去完成时的用法。
accident, first, main, them, keep, pollute, settler, harm, appear, balance, although, people |
Nowadays, the hazy (雾霾的) weather often 1. in our country. It has not only affected the public transportation but also done great 2. to people’s health. Terrible 3. happen every now and then. Some freeways are shut down because of the low visibility (能见度). In Nanjing, schools had to close because of the hazy weather last December.
Obviously, air pollution is the (4. cause that has resulted in (导致) the terrible weather. People don’t pay much attention to the environment, so the 5. between nature and human beings is lost.
People have started to consider how to protect6. on hazy days. They try to avoid outdoor activities and wear expensive masks to 7. away from haze while going out. But actually, no one can really keep away from it8. they wear masks or stay inside. Haze is everywhere around the city.
Haze is a warning. It warns us to take action to make our Earth a better place. If Earth is too9. for us to live on, what should we do? Maybe we have to be 10. on Mars.