I.单项选择（共15小题；每小题1分，满分15分）
1. Experts think that _________ recently discovered painting may be_________ Picasso.
A. the; a B. a; the C. a; / D. the; /
2. According to a UN report, one third of the world population have no _________ to clean drinking water and health care.
A. means B. approaches C. ways D. access
3. Ruth sold most of her belongings. She has hardly_________ left in her house.
A. anything B. nothing C. everything D. something
4. The performance of the host, _________ to please the audience and draw their attention, was greeted with a cold silence, however.
A. had intended B. intended C. intending D. to intend
5. _______ for the doctor’s careful treatment, he _______ till last year.
A. If it is not; can’t live B. Were it not; couldn’t live
C. Had it not been; couldn’t have lived D. If it were not; wouldn’t live
6. _______, I lost heart in English learning, but my teacher said to me, “Keep on working hard, and you’ll succeed ________.”
A. At a time; in time B. At one time; in time
C. At a time; on time D. At one time; on time
7. _______ on rescuing her sick son, the poor mother has been working 16 hours a day.
