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【多选题】
一般教科书对人的需求划分为()。A.
生物性需要
B.
文化性需要
C.
生存性需要
D.
社会性需要
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【简答题】Today we spent the morning going through our personal belongings .We were looking for items to __ for free at a local park. Not just any items but things people really . Our aim was not to find things...
【单选题】把纯净的甲烷和氯气混合于集气瓶中,用玻璃片盖住瓶口,放在光亮的地方,片刻后移动玻璃片,留一条缝,此时观察到的现象有: 1 发生爆炸; 2 瓶口有白雾; 3 瓶内气体颜色变浅; 4 瓶内有油状物。其中正确的是 ( )
A.
①②③
B.
②③④
C.
①③④
D.
①②④
【单选题】We were going out for a walk ________ it began to rain.
A.
while
B.
before
C.
as
D.
when
【单选题】_____the wind and waves we were going in the direction of the whirlpool,and nothing could save us.
A.
By
B.
At
C.
To
D.
With
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