听句子，缩写原文。（）

A．We cannot reach an agreement, let alone a spoken promise.

B．We’d better draft and then sign a written agreement.

C．We generally keep our promises in business transactions.

D．We hope you understand why we are unable to keep our promises.

细胞以浸润性方式生长，可以通过淋巴、血液及浆膜腔转移的肿瘤叫做（）。

A.肿瘤

B.恶性肿瘤

C.动态未定的肿瘤

D.性质未特指的肿瘤

E.原位癌