一物体以恒定的速率v1向东运行，当它刚到达距离出发点为d的一点时，立即以恒定的速率v2往回运动并回到原处。问：（1）全程的平均速度是？（2）全程的平均速率是？

A. By saving a larger portion of its GDP, a country can raise its output per worker.
B. Savers supply their money to the financial system with the expectation that they will get it back with interest at a later date.
C. Financial intermediaries are the only type of financial institution.
D. The financial system helps match people’s saving with other people’s borrowing.

A. Lenders sell bonds and borrowers buy them.
B. Long-term bonds usually pay a lower interest rate than do short-term bonds because long-term bonds are riskier.
Corporations sell bonds to raise funds.
D. None of the above is correct.

A. is the total income in the economy that remains after paying for consumption.
B. is the total income in the economy that remains after paying for consumption and government purchases.
C. is always greater than investment for a closed economy.
D. is equal to private saving minus public saving.

A. only Larry's
B. only Curly Corporation's
C. Larry's and Curly Corporation's
D. neither Larry's nor Curly Corporation's