单项选择题

A．prevent people from having trouble with teeth
B．stop teeth from falling out
C．put men on the moon
D．transplant hearts and other organs
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单项选择题
A．the strategic partnership between the ELI and ChinaB．the dialogue in all areasC．the British effort to strike a deal on the ELI code of Conduct on arms exportsD．the US-EU relationship
A．the strategic partnership between the ELI and China
B．the dialogue in all areas
C．the British effort to strike a deal on the ELI code of Conduct on arms exports
D．the US-EU relationship
单项选择题
A．According to the movement and vibrations of hot gassesB．The trade winds blow on EarthC．The riversD．The sound travel through the space
A．According to the movement and vibrations of hot gasses
B．The trade winds blow on Earth
C．The rivers
D．The sound travel through the space
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