单项选择题

A: Please deposit twenty more cents. B: ______.

A．Oh, dear, I don't have any more money. I'!1 have to hang up now.
B．Deposit twenty more cents. It's an astronomical figure for me.
C．Sorry, I didn't owe you twenty more cents.
D．Sorry, I didn't even have a bank account book.

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单项选择题

German scientists in charge of the studies ______.

A．thought that the surface soil of Mars is mainly composed of silicon and iron, with a bit of sulfur, chlorine and argon
B．doubted if there is any content of silicon and iron, with a bit more of sulfur, chlorine and argon
C．confirmed that the Martian surface emitted X-rays, which indicated the main composition of the Martian soil
D．indicated that the surface soil of Mars has a main chemical composition of silicon and iron