Withprice______somuch,it'shardtoplanabudget. A: tumbling B: tilting C: fluctuating D: flapping

What disturbs investors is the fact that the market has been fluctuating (波动) irrationally (非理性地) (recently).

The scenery is()and the accommodations are first-class.We had a good trip. A: frightening B: fascinating C: fluctuating D: forbidding

Which of the following problems can cause fluctuating pressures in the closed cooling system of a main propulsion diesel engine?（）

Fluctuating foreign currency exchange rates may constitute a high ( ) risk for international trade. A: venue B: revenue C: avenue D: hue

Why is water problem a complicated one? A: There's no alternative. B: Water is intertwined with every other sector of society. C: Water demands are growing at the same time supplies are fluctuating(波动).

Western nations have older and shrinking populations since they entered the 21st century and their ___ birth rates have also posed problems. A: fluctuated B: fluctuating C: fluctuate D: fluctuates

Western nations have older and shrinking populations since they entered the 21st century and their __________birth rates have also posed problems. A: stable B: mobile C: constant D: fluctuating

Western nations have older and shrinking populations since they entered the 21^stcentury and their ____________ birth rates have also posed problems. A: flowing B: fluctuating C: floating D: drifting

In the punctuated equilibrium (间断平衡) model of evolution, periods of evolution are 　. A: long, with gradual change B: long, with rapid change C: long, with fluctuating change D: short, with slow change E: short, with rapid change