2,4-二硝基苯酚(DNP)是一种对人体毒性很大的物质。它会显著地加速代谢速率,使体温上升、出汗过多,严重时可导致虚脱和死亡。1940年代曾试图用DNP作为减肥药物。(1)为什么DNP的消耗会使体温上升,出汗过多?(2)DNP作为减肥药物的设想为何不能实现?
_____ was the weather like in Changsha?
A. How
B. Where
C. When
D. What
She _____ to take her book two hours ago.
A. returned
B. returns
C. returning
D. return
Mary and Rose enjoyed _____ when they went skiing yesterday.
A. herself
B. yourselves
C. themselves
D. yourself