双烯选择加氢催化剂是利用（）加热氢气来还原的。
A.脱氢反应加热炉
B.导热油
C.脱氢开工加热炉
D.蒸汽
参考答案：C
穿过腮腺内的神经是（）
A.颈神经
B.喉返神经
C.面神经
D.咽神经
E.舌神经
My parents are always telling me to leave everything in the study_____. [ ]
A. as they were
B. as it was
C. like they were
D. like it was
