A this question examines climate types. The lowest monthly temperature in Figure A is below 1 C, and the precipitation is concentrated in summer, so it is judged as a temperate monsoon climate. Consistent with the climate in Beijing; The lowest monthly temperature in Figure B is above 1 C, and the precipitation is concentrated in summer, so it is interpreted as subtropical monsoon climate, which is consistent with the climate in Changsha. Figure C reflects the low temperature in summer and little precipitation all year round, which is consistent with the climate in Lhasa. So choose item a.