GRE Text Completion: JiJing 1373-GRE填空机经1373题 - 430D8IG17A7A9VFBA

After rising continuously over the summer, commodity prices fell, leaving analyst wondering whether the downward trend is a turning point or merely a ____________ before demand picks up in the winter months. A. spike B. upsurge C. harbinger D. portent E. lull F. respite