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【简答题】
下列氨基酸中属于人类必需氨基酸的是( ) A．苯丙氨酸 B．酪氨酸 C．丝氨酸 D．苏氨酸
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举一反三
【单选题】After ten years in the shoe trade, Colin's contacts are in the retail sector. (primarily)
A.
Primarily, after ten years in the shoe trade, Colin's contacts are in the retail sector.
B.
After ten years in the shoe trade, Colin's contacts are primarily in the retail sector.
【单选题】Despite the fact that they were____when they married,after 30 years they live together harmoniously.
A.
contradictory
B.
incompatible
C.
contrary
D.
compatible
【单选题】Even after having their grandchildren live with them for ten years, the couple felt that ______ children these days was the most difficult of all family matters.
A.
rising
B.
raising
C.
caring
D.
taking care
【单选题】I want to live in the moon . [ ]
A.
in ten years
B.
ten years ago
C.
after ten years
D.
later ten years
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