Mark the letter A, B, C, or D to indicate the word(s) CLOSEST in meaning to the underlined word(s) in each of the following questions. ( giải thích chi tiet dùm t vs ) 1.I believe the government will use advancedtechnology to build faster trains and make people's life more comfortable. A. modern B. expensive C. public D. latest 2.Many city dwellers, especially those in developing countries, still live in poverty. A. people B. migrants C. immigrants D. residents 3.These projects have proved to be very effective in dealing with global climate change, which was considered an insoluble problem in the first 30 years of this century. A. hard B. challenging C. unsolvable D. unbearable