皮皮学，免费搜题
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【单选题】
免疫系统是由A.
中枢免疫器官和外免疫器官组成
B.
免疫器官和和黏膜免疫系统组成
C.
胸腺和骨髓组成
D.
免疫器官、免疫细胞和免疫分子组成
E.
T细胞和B细胞组成
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皮皮学刷刷变学霸
举一反三
【单选题】In the sunny morning, some English people usually take a raincoat or an umbrella with them because ______.
A.
their friends ask them to do so
B.
it often rains in England
C.
they are going to sell them
【单选题】In the sunny morning some English people usually take a raincoat or an umbrella with them because ________.
A.
their friends ask them to do so
B.
it often rains in England
C.
they are going to sell them
D.
they are their favourite things
【单选题】We all had fun in the supermarket a sunny morning.
A.
shop; on
B.
shopping; in
C.
shopping; on
D.
shopping; /
【简答题】When you go to England, you will see that some English people usually take an umbrella(伞) or a raincoat (雨衣) with them in the sunny morning.
【单选题】When you go to England, you will see that some English people usually take an umbrellaĩೢĪor a raincoat with them in the sunny morning, but you should not ______ at them.
A.
laugh
B.
smile
【简答题】总体剪切侧移是由梁、柱 变形所导致的框架侧移A. 弯曲
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