[单项选择]Alice began to learn English since 5 years ______.


A. before
B. ago
C. later

[单项选择]Alice began to learn English since 5 years ______.


A. before
B. ago
C. later

[单项选择]Since I began to work here three years ago, this factory ______ in size.

[单项选择]I began to learn English （）I was five.
A. when
B. since
C. if

[单项选择]My grandma began to learn English ______.
A. in her fifties
B. in her fifty
C. at fifties
D. at fifty

[单项选择]Since these years, American adults have improved the most in ______.
A. performing math problems
B. finding information in a book
C. answering questions involved numbers
D. comparing two different newspaper commentaries

[单项选择]

Since life began eons ago, thousands of creatures have come and gone. Some, such as the dinosaurs, became extinct due to naturally changing ecologic conditions. More recent threats to life forms are humans and their activities. Man has drained marshes, burned prairies, dammed and diverted rivers. Some of the more recent casualties of man's expansion have been the dodo, great auk, passenger pigeon, Irish elk, and Steller's sea cow. Sadly, we can no longer attribute the increasing decline in our wild animals and plant species to "natural" processes. Many species are dying out because of exploitation, habitat alteration or destruction, pollution, or the introduction of new species of plants and animals to an area. As mandated by Congress, protecting endangered species, and restoring them to the point where their existence is no longer jeopardized, is the primary objective of the U.S. Fish and Wildlife Service's Endangered Species Program.

Which of the foll
A. Glacial encroachment.
B. Hurricanes.
C. Dammed rivers.
D. Snowstorms.

[单项选择]

Text 3
Since USAID began its first HIV/AIDS prevention efforts eight years ago, the epidemic has changed dramatically. HIV has spread to every region of the world. Millions of people infected with HIV during the first decade of the epidemic are developing opportunistic infections and other AIDS-related illnesses, and many are dying. Women and children are among those most vulnerable to HIV infection. As HIV prevalence and AIDS mortality soar, millions of children will lose their parents.
HIV/AIDS is having a devastating impact on the health and well-being of families, communities and nations worldwide. The epidemic’s effects on the structure of societies and the productivity of their members undermine efforts to promote sustainable development around the globe. USAID’ s approach to slowing the spread of HIV/AIDS relies on strategies tested and refined over the past eight years. At the same time, the Agency is moving forward to address new challe
A. proves that the epidemic has been spreading very fast over the past eight years
B. implies that the USAID was not very successful in the past eight years
C. shows that the epidemic has spread too fast to be controlled over the past eight years
D. explains that the epidemic has been controlled

[单项选择]Fifteen years have passed since we graduated from the middle school.I have found she has（）.
A. some white hair
B. much white hair
C. a few white hairs
D. a little white hair