导游员带团时，必须持有旅行社下发的_____，这是导游员合法工作的前提。
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毛泽东思想是以毛泽东为主要代表的中国共产党集体智慧的结晶。()
保护接地是用以防止间接接触电击最基本的安全措施之一,它主要适用于哪些系统或电网？
The book Kids Are From Mars, Parents Are From Venus is mentioned in the third paragraph because
A. it has the opposite opinion to the book written by the two girls.
B. it has ranked first on the list of best sellers for several times.
C. it has the same theme with the book written by the two girls.
D. it is another book that the two girls have ever written.
Why has the euro gained an interest rate？
A. It is the result of the rise of stock markets.
Because bank shares have risen especially strongly.
C. Because the debts of governments such as Greece and Portugal have fallen.
D. Because the central banks began to buy governments debts in the markets.
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