The first known census report took place in Babylonia in_____.
A. 1085
B. 1200 B.C.
C. 3800 B.C.
D. 1790
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The American census today costs the government approximately_____.
A. $ 0. 0/person
B. $ 0. 10/person
C. $1. 00/person
D. $ 10. 00/person
计算机操作系统中，若WAlT、SIGNAL操作的信号量S初值为3，当前值为-2，则表示当前有()个等待信号量S的进程。
A. 1
B. 2
C. 3
D. 0
The passage suggests that____.
A. buying and selling securities is dishonest
B. investing in securities is unwise
C. some exchanges provide market services for several kinds of products
D. the government has been playing an important role in controlling dishonest practices on the exchanges
Investing in securities has been safer by the____.
A. Chicago Mercantile Exchange
B. Chicago Board of Trade
C. Securities Exchange Commission
D. Commodity Exchange
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