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【单选题】
下列关于胶原的结构和类型，哪项叙述是错误的A.
胶原分子由３条分别称为α、β、γ的α-螺旋链组成
B.
构成胶原的多肽链中的甘氨酸约占１/3，富含脯氨酸和赖氨酸
C.
肽链中的氨基酸的三肽重度顺序为Gly-X-Y或Gly-pro-Y及Gly-X-Hyp
D.
脯氨酸和赖氨酸常羟基化和糖基化
E.
肽链中几乎不含色氨酸、酪氨酸和蛋氨酸
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【单选题】Choose the best answer to complete the paragraph. My friend and I are planning a trip to Brazil. We're going to save money by staying in ________ and camping on the beach. I hope we have nice ____! We...
A.
groups
B.
countries
C.
sites
【单选题】Choose the best answer to complete the paragraph. My friend and I are planning a trip to Brazil. We're going to save money by staying in ____1____ and camping on the beach. I hope we have nice ____! W...
A.
youth hostels
B.
museums
C.
nice hotels
【单选题】Choose the best answer to complete the paragraph. My friend and I are planning a trip to Brazil. We're going to save money by staying in ________ and camping on the beach. I hope we have nice ____! We...
A.
active
B.
boring
C.
frightening
【简答题】W=Waiter G=Guest W: Would you like any salad? G: No, we're full. I'd like to _________________ (1) now. W: A bill for each or a bill for all? G: _______________________ (2). It's my treat. W: How...
【单选题】We are going to Yunnan for vacation. We're staying there _____ half a month. [ ]
A.
for
B.
in
C.
after
D.
until
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