During the long course of history, the Chinese people have, working with diligence, bravery and wisdom, created _________ beautiful homeland where all ethnic groups live in harmony, and developed _______ great culture.

A．a, a

B．/, the

C．/, a

D．a, the

以下对氮芥类抗肿瘤药的说法正确的是（）

A.属于烷化剂

B.是β-氯乙胺类化合物的总称

C.其结构分为两部分。烷基化部分和载体部分

D.载体可改善该类药物在体内的吸收、分布

E.以上都对