皮皮学，免费搜题
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搜题
【单选题】
下列关于电子邮件的说法,正确的是A.
收件人必须有E.mail地址,发件人可以没有E-mail地址
B.
发件人必须有E.mail地址,收件人可以没有E-mail地址
C.
发件人和收件人都必须有E.mail地址
D.
发件人必须知道收件人住址的邮政编码
拍照语音搜题，微信中搜索"皮皮学"使用
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】I'm very grateful for your help and hope to do something for you _____ in the future.
A.
in exchange
B.
instead
C.
in return
D.
in particular
【单选题】Speaker A: Yes, can I help you? Speaker B: ______
A.
Thanks. I'm very grateful for your help.
B.
We're just looking. Thanks.
C.
Yeah, can you help me with this experiment?
D.
Yes. Can you tell me how to get to the National Library?
【简答题】试述热凝树脂的制作义齿基托时产生气泡的原因有哪些?
【单选题】I’m very grateful to Professor Smith, without __________ help I would have never have got this far.
A.
who
B.
whose
C.
whom
D.
which
【单选题】I'm very grateful for your help and hope that some day I will be able to do something for you________. [ ]
A.
in exchange
B.
in turn
C.
in return
D.
in particular
【单选题】I’m very grateful to my high school teachers, without ______ help I wouldn’t be so excellent.
A.
whom
B.
their
C.
which
D.
whose
【简答题】热凝义齿基托树脂产生气泡的原因分析
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