Why it is unrealistic to send astronauts back to the moon now？
A. Because the White House warned them not to do now.
Because the panel of experts objected the proposals.
C. Because the space agency didn"t allocate adequate money.
D. Because it would take too much money to fulfill it.
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风能利用存在一些限制及弊端()。
A风速不稳定，产生的能量大小不稳定
B风能利用受地理位置限制严重
C风能的转换效率低
D风能是新型能源，相应的使用设备也不是很成熟
广东现代服务业发展存在的主要问题：()。
A服务业区域差距明显，空间布局不均衡
B总量与层次偏低，内部结构又待进一步升级
C市场化程度不高，总体竞争能力不强
D思想观念守旧，创新力度不够
How many people lost their lives in the volcanic eruption？
A. 100.
B. 13.
C. 13,000.
D. 113.
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