请根据短文内容，回答题。 The Caribbean IslandsWhat would you see if you took a cruise to the

请根据短文内容，回答题。

Plant Gas

Scientists have been studying natural sources of methane for decades but hadn&39;t regarded plants as a producer, notes Frank Keppler, a geochemist at the Max Planck Institute for Nuclear Physics in Heidelberg, Germany. Now Keppler and his colleagues find that plants, from grasses to trees, may also be sources of the greenhouse gas. This is really surprising, because most scientists assumed that methane production requires an oxygen-free environment.<br>

Previously, researchers had thought that it was impossible for plants to make significant amounts of the gas. They had assumed that microbes need to be in environments without oxygen to produce methane. Methane is a greenhouse gas, like carbon dioxide. Gases such as methane and carbon dioxide trap heat in Earth&39;s atmosphere and contribute to global warming.<br>

In its experiments, Keppler&39;s team used sealed chambers that contained the same concentration of oxygen that Earth&39;s atmosphere has. They measured the amounts of methane that were released by both living plants and dried plant material, such as fallen leaves.<br>

With the dried plants, the researchers took measurement at temperatures ranging from 30 degrees Celsius to 70 degrees C. At 30 degrees C, they found, a gram of dried plant material released up to 3 nanograms of methane per hour. (One nanogram is a billionth of a gram.) With every 10-degree rise in temperature, the amount of methane released each hour roughly doubled.<br>

Living plants growing at their normal temperatures released as much as 370 nanograms of methane per gram of plant tissue per hour. Methane emissions tripled when living and dead plant was exposed to sunlight.<br>

Because there was plenty of oxygen available, it&39;s unlikely that the types of bacteria that normally make methane were involved. Experiments on plants that were grown in water rather than soil also resulted in methane emissions. That&39;s another strong sign that the gas came from the plants and not soil microbes.<br>

The new finding is an "interesting observation," says Jennifer Y. King, a biogeochemist at the University of Minnesota in St. Paul. Because some types of soil microbes consume methane, they may prevent plant-produced methane from reaching the atmosphere. Field tests will be needed to assess the plant&39;s influence, she notes.

What was scientists‘ understanding of methane? 查看材料

A.It was produced from plants

B.It was not a greenhouse gas

C.It was produced in oxygen-free environments

D.It traps more heat than any other greenhouse gas

A bank statement tells you __________. 查看材料

A.the amount of money you have in the bank

B.the current rates of interest

C.the current rates of exchange

D.the best way to save your money

A bank pays you interest for __________. 查看材料

A.wasting your money

B.losing your money

C.using your money

D.decreasing your money

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Saving Money

Where you save your money often depends on what you are saving for. If you are saving to buy a CD (光盘) or to go to a concert, then probably you would keep your money somewhere in your room.<br>

If you are saving for a big purchase like a mountain bike or a school trip, where would you save your money?<br>

One place to save money is the bank. Putting your money in a savings account will help your money earn more money. If you put your money in a piggy bank (猪形储蓄罐) , one year later you&39;ll still have the same amount of money you put in. If you put your money in a savings account,one year later, you&39;ll have more money than you put in. Why?<br>

When you keep your money in a bank, your money earns interest. Interest is the amount of money a bank pays you to use your money. The bank uses your money (and the money of other people, too) to loan money to people and businesses.<br>

The bank will send you a statement several times a year. A bank statement tells you how much money you have in your. account. It also tells you how much interest you have earned. If you leave your money in the bank, you can watch it grow!<br>

Another way you can save money is to buy a certificate of deposit or CD. If you have some money that you don&39;t need to use for a long time, this is a good way to make your money grow.<br>

You can buy a CD at a bank. You agree not to use the money for a certain period of time. That period might be from six months to five years. You can&39;t touch your money during that time. If you do, you must pay a penalty, or fee.

Your money will earn more money if you put it__________. 查看材料

A.in your room

B.in a piggy bank

C.in your pocket

D.in a savings account

查看材料

A.the timely （及时的） discovery

B.convenience

C.sex equality

D.its connection with humans

E.the huge power

F.its uncertainty

查看材料

A.the timely （及时的） discovery

B.convenience

C.sex equality

D.its connection with humans

E.the huge power

F.its uncertainty

材料

A.the timely （及时的） discovery

B.convenience

C.sex equality

D.its connection with humans

E.the huge power

F.its uncertainty

查看材料

A.the timely （及时的） discovery

B.convenience

C.sex equality

D.its connection with humans

E.the huge power

F.its uncertainty

Paragraph 5 __________ 查看材料

A.Short history of naming hurricanes

B.Harnessing the hurricane energy

C.Difficulty in forecasting the course of a hurricane

D.Huge energy stored in a hurricane

E.Forecasting a hurricane through satellite watching

F.Different names for the same things

Paragraph 4 __________ 查看材料

A.Short history of naming hurricanes

B.Harnessing the hurricane energy

C.Difficulty in forecasting the course of a hurricane

D.Huge energy stored in a hurricane

E.Forecasting a hurricane through satellite watching

F.Different names for the same things