A、Banks. B、Credit unions. C、Financial institutions. D、Money market funds. D文中说：存钱的另一种方式是购买货币基金，这是一种共同基金。共同基金拿许多人的钱去投资。这些钱有时投资于短期

"A penny saved is a penny earned." This old saying calls attention to the wisdom of saving money. "Putting money away for a rainy day" is another way to talk about saving for the future.
    In the United States, people who want to start a savings account have different choices of where to put their money. These include banks and credit unions. Credit unions are cooperatives for people who have some kind of connection. For example, the members might work for a university or a government agency. Most credit unions are nonprofit organizations.
    Credit unions, banks and other financial institutions pay interest on savings accounts. But the interest rates are low. Certificates of deposit pay higher returns. With a certificate of deposit or CD, a person agrees not to withdraw the money for a certain period of time. This term could be anywhere from a few months to several years. Longer terms, and larger amounts, pay higher interest. People can withdraw their money early but they have to pay a penalty.
    Another way to save is through a money market fund. This is a kind of mutual fund. Mutual funds invest money from many people. The money is sometimes placed in short-term government securities. Money market funds, however, may not be federally guaranteed like other kinds of savings. The Federal Deposit Insurance Corporation guarantees savings up to two hundred fifty thousand dollars.
    In a number of countries, people have been saving less over the years. The Organization for Economic Cooperation and Development is a group of thirty-four countries. This organization says in nineteen ninety Americans had a household savings rate of seven percent. This year, that rate is expected to be a little more than two percent. Many European countries have higher rates, but Americans save more than families in Japan.
Q13: What is true about a certificate of deposit?
Q14: Which kind of savings may not be federally guaranteed?
Q15: Where is the household savings rate relatively high?