皮皮学，免费搜题
登录
搜题
【单选题】
对肿瘤细胞具有特异性杀伤作用的细胞是A.
巨噬细胞
B.
细胞毒性T细胞
C.
中性粒细胞
D.
NK 细胞
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【简答题】The purpose of Subject Line is ( ) the topic of the letter.
【判断题】The subject line states what the letter is about. The short form “Re.” may precede the phrase that carries the subject matter.
A.
正确
B.
错误
【单选题】What does the subject line tell the recipients?
A.
What the letter is about.
B.
When the letter has been sent.
C.
Who wrote the letter.
D.
Who typed the letter.
【判断题】The subject line states the gist of what the letter is about. The short form “Re.” may precede the phrase that carries the subject matter.
A.
正确
B.
错误
【简答题】Judging from the subject line, what is this email mainly about? The subject line shows that the writer wants to tell the recipient that she has come back to ___________ .
相关题目：