9923

47. 13251

48. 3920

49. 110926

50. 5621

(1)按顺序填数。-|||-46 47 48 49 50

[单选题]8 15 24 35 ( )A． 47 B 48 C 49 D 50

40 41 42 43 44 45 46 47 48 49 50-|||-□+| |=□

(48approx 50 题共用备选答案)-|||-A.氧 B.氮 C.氢-|||-D.氟 E.磷-|||-48.在核酸中比例相对稳定的元素是-|||-49.蛋

[单选题]49．A．itB．thereC．thatD．this

[单选题]49．A．withB．fromC．toD．on

[单选题]49. A. Although B. OrC. But D. If

[单选题]_________________( )47.A. it’sB． itsC． itD． is

[单选题]47．A．inB．forC．duringD．around

[单选题]47．A．everythingB．somethingC．nothingD．anything