皮皮学，免费搜题
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【单选题】
当时人类迁徙活动的( )都说明这类活动不属于现今意义上的旅行和旅游。A.
被迫性和求生性
B.
被迫性和自由性
C.
独立性和求生性
D.
独立性和自由性
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】设有关系模式销售(顾客号,商品号,销售时间,销售数量),若允许一个顾客在不同时间对同一个产品购买多次,则此关系模式的主码是
A.
顾客号
B.
产品号
C.
(顾客号,商品号)
D.
(顾客号、商品号、销售时间)
【单选题】Jenny __________in the kitchen when you called her at 5 o’clock this afternoon?
A.
is cooking
B.
was cooking
C.
cooks
D.
cooked
【判断题】Eugene O’Neil,Arthur Miller and Tennessee Williams are together called “founders of the American drama.”()
A.
正确
B.
错误
【单选题】All the firemen in the city were ______to fight against the big fire.
A.
called in
B.
called off
C.
called up
D.
called on
【单选题】设有关系模式,销售(顾客号、商品号、销售时间、销售数量),若一个顾客可以在不同的时间对同一产品购买多次,同一顾客在同一时间可购买多种商品,则此关系模式的主键是
A.
顾客号
B.
（顾客号、商品号、销售时间）
C.
产品号
D.
（顾客号、商品号）
【单选题】What did scientists think was true?
A.
Each person has a fixed weight range．
B.
Each person has a weight ranged of 9 kg．
C.
Each person wants to control his weight．
D.
Each person wants to eat to his heart’s content．
【单选题】People believe that each person has a rightful(合法的) and protected place in the social order.
A.
LOW
B.
HIGH
【单选题】Jenny _____in the chicken when you called her at 5 o’clock this afternoon?
A.
is cooking
B.
was cooking
C.
cooks
D.
cooked
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