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【单选题】
The before-trade price of fish in Denmark is $10.00 per pound. The world price of fish is $6.00 per pound. Denmark is a price-taker in the fish market. If Denmark begins to allow trade in fish, its consumers of fish will become
A.
better off, its producers of fish will become better off, and on balance the citizens of Denmark will become better off.
B.
worse off, its producers of fish will become better off, and on balance the citizens of Denmark will become worse off.
C.
worse off, its producers of fish will become better off, and on balance the citizens of Denmark will become worse off.
D.
better off, its producers of fish will become worse off, and on balance the citizens of Denmark will become better off.
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参考答案:
举一反三
【判断题】水与钻石的价值之谜的解释是钻石的总效用高。( )
A.
正确
B.
错误
【判断题】xF(x) →( x yG(x,y) → xF(x) ) 是矛盾式.
A.
正确
B.
错误
【简答题】观察算式: 1 1×2 =1- 1 2 = 1 2 1 1×2 + 1 2×3 =1- 1 2 + 1 2 - 1 3 = 2 3 1 1×2 + 1 2×3 + 1 3×4 =1- 1 2 + 1 2 - 1 3 + 1 3 - 1 4 = 3 4 (1)按规律填空 1 1×2 + 1 2×3 + 1 3×4 + 1 4×5 + 1 5×6 =______ 1 1×2 + 1 2×3 + 1 3...
【简答题】观察下列等式 1 1×2 =1- 1 2 , 1 2×3 = 1 2 - 1 3 , 1 3×4 = 1 3 - 1 4 ,将以上三个等式两边分别相加得: 1 1×2 + 1 2×3 + 1 3×4 =1- 1 2 + 1 2 - 1 3 + 1 3 - 1 4 =1- 1 4 = 3 4 . (1)猜想并写出: 1 n(n+1) = ______ (2)直接写出下列各式的计算结果: ① 1 1×...
【简答题】“舅舅-外甥”构成 ( ) 义场;“助教—讲师—副教授-教授”构成 ( )义场;纸-笔-墨-砚”构成 ( ) 义场 ;
【多选题】关于脊髓灰质炎病毒的叙述正确的是:
A.
为球形RNA病毒
B.
分I、II、III三个血清型
C.
只引起一次病毒血症
D.
抵抗力强,在污水和粪便中可存活数月
E.
可在脊髓前角运动细胞内增殖引起细胞病变,重者可造成肢体弛缓性麻痹
【简答题】阅读下面的材料: 1 1×2 =1- 1 2 ; 1 2×3 = 1 2 - 1 3 ; 1 3×4 = 1 3 - 1 4 … 所以 1 1×2 + 1 2×3 + 1 3×4 =1- 1 2 + 1 2 - 1 3 + 1 3 - 1 4 =1- 1 4 = 3 4 根据上面的规律解答下面的问题: (1) 1 1×2 + 1 2×3 + 1 3×4 +…+ 1 10×11 =______ (2...
【简答题】观察下列等式: 1 1×2 =1- 1 2 , 1 2×3 = 1 2 - 1 3 , 1 3×4 = 1 3 - 1 4 ,将以上三个等式相加得: 1 1×2 + 1 2×3 + 1 3×4 =1- 1 2 + 1 2 - 1 3 + 1 3 - 1 4 =1- 1 4 = 3 4 . (1)猜想并写出: 1 n(n+1) =______. (2)直接写出结果: 1 1×2 + 1 2×3 + ...
【单选题】关于脊髓灰质炎病毒叙述正确的是:( )
A.
只有一个血清型
B.
是RNA病毒
C.
细胞培养不出现CPE
D.
在自然环境中抵抗力较差
E.
不引起病毒血症
【单选题】关于脊髓灰质炎病毒叙述正确的是:
A.
只有一个血清型
B.
是DNA病毒
C.
不引起病毒血症
D.
隐性感染少见
E.
可引起肢体麻痹
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