一、单项选择
1. Suicide is a major public health problem, ________ that significantly affects social and economic development and needs the special attention.
A. it B. one C. the one D. that
2. Face book’s next move as it tries to obtain more ________ will be to enter China, where it doesn’t now offer its product.
A. reserve B. revision C. reference D. revenue
3. As the Internet is open and transnational, no country can effectively ________ the global challenge single-handedly.
A. address B. advance C. advocate D. attain
4. The demand for clean organic food ________ and more people are interested in what they are putting into their mouths.
A. grew B. has been growing C. will grow D. had grown
