单项选择题

Attempts have been made for nearly three decades to increase the amount of precipitation from clouds by seeding them with salt or silver iodide.()

A. Devices
B. Hypotheses
C. Efforts
D. Suggestions

<上一题 目录 下一题>
热门 试题

单项选择题
Many plants lie dormant throughout the whole winter.
A．temporally inactive
B．sleeping
C．unconscious

D．brown
单项选择题
It is reported that the latest outbreak of the bird flu in Pennsylvania in the United States has prompted China to slap a ban on poultry imports from the state.()

A. marine products
B. dairy products
C. industrial products
D. avian products
相关试题