【单选题】.If we humans beings continue to waste and destroy natural resources without using _____ energy, such as the energy from the sun, wind and water, our earth will be done for.
【单选题】Almost without interference, he has been able to continue threatening, challenging and harassing his competitors, and thus, wholly______, he has spouted more______of acerbic spirit.
【简答题】Bond 1 has an effective duration of 3.7. If the bond yield changes by 100 basis points, the price of the bond will change by: A. approximately 0.37%. B. approximately 3.7%. C. exactly 0.37%.