【单选题】You would like to buy a new automobile. The car costs $68,500. If you can earn 9 percent, how much do you have to invest today to buy the car in two years?
【简答题】微生物主要由水分和干物质组成,其中水分占 。
【单选题】It is worth much __________is worth doing. [ ]
【判断题】中子星的发现是先有理论的预言,然后才在天文学上发现的。()
【简答题】微生物的干物质主要由无机物和有机物组成,其中无机物占 。
【多选题】通常,评价一个算法有正确性、 _________ 、 _________ 、_________、_________五个方面。