下列烯烃氢化热（KJ/mol）最低的是（）。
A.A
B.B
C.C
D.D
参考答案：D
Doyle makes good use of many literary devices in his detective novel to ____ an impression of tension and mystery.
A．advocate
B．convey
C．describe
D．attract
补写出下列名句名篇中的空缺部分。(只选两小题)
(1)我闻琵琶已叹息，又闻此语重唧唧。________________,________________!(白居易《琵琶行》)
(2)千古江山，________________。舞榭歌台，_______________。(辛弃疾《永遇乐·京口北固亭怀古》)
(3)故不积跬步，无以至千里；____________。骐骥一跃，不能十步；____________。(荀子《劝学》)
