皮皮学，免费搜题
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【单选题】
青霉素正相萃取的pH值是A.
1.8-2.0
B.
2.8-3.0
C.
3.8-4.0
D.
4.8-5.0
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皮皮学刷刷变学霸
举一反三
【单选题】In a formal English letter of invitation____appears first.
A.
the receiver's name
B.
the sender's name
C.
the date on which it is prepared
D.
the place in which it is prepared
【单选题】Where is date in an English letter?
A.
on the top and under the adressee's address
B.
on the top and under the adresser's address
C.
at the bottom of the letter under the signature
D.
at the bottom of the letter under the complimentary close
【简答题】祈年殿中心地面，有一块龙凤图案的天然大理石，其表面黑色纹路，颇像一条行龙和一只飞凤。龙纹色深，角、须、爪、尾俱全；凤纹色浅，嘴、眼、羽毛清晰可辨。此石被称为“龙凤呈祥”石。请问此段是导游口语表达的哪种形式？
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