磷酸二酯酶抑制药是（）
A.阿司匹林
B.埃替巴肽
C.氯吡格雷
D.西洛他唑
E.肝素
参考答案：B
我国现存最早、最完备的农书是北魏贾思勰的《______ 》。世界上第一部茶叶专著是唐代______的《茶经》。
完成句子：(共5小题，10个空，每空1分，满分10分)
小题1:When the war ______ ______ (爆发), he was working in the navy.
小题2:I can’t ______ ______(想出)why she said that.
小题3:______ ______he is free will he come to see me.
小题4:______ ______ a good teacher, John made great progress in his English study last term.
小题5:If I have a choice I would ______ ______ choose something else.
