1. As child, Salk did not show any interest in medicine or science in general.
A. 不填；不填 B. the；不填 C. a；不填 D. a；the
2. The Yangtze River, China’s longest, has been affected by a severe drought, the lowest level of rainfall this year since 1961.
A. with B. for C. beyond D. besides
3. In the US they focus on creative thinking skills, in China they only focus on theory.
A. since B. when C. while D. now that
