For many years, people（）electric cars. However, making them has been more difficult that predicted.

A. had dreamed of

B. have dreamed of

C. dreamed of

D. dream of

糖皮质激素抗休克作用的机制，不正确的是（）

A.抗炎作用、免疫抑制

B.抗毒作用

C.使痉挛血管收缩，升高血压

D.加强心肌收缩力，使心输出量增多

E.稳定溶酶体膜，减少心肌抑制因子的形成