Question

Biodiesel is an alternative way to fuel any diesel engine and reduce the amount of carbon released by the vehicle. However, creating biodiesel fuel may take more energy than it takes to use fossil fuels. When calculating the energy used, scientists consider several factors. They look at the energy it takes to grow the crops. That includes fuel to run farm machinery and to irrigate the crops. Then, they consider the energy it takes to turn the crops into biodiesel. Different crops have different energy totals. Sunflower plants use 118 percent more energy than they produce. Soybeans use 27 percent more energy. Sugarcane, scientists have found, creates more energy than it takes. Methods of production that reduce the energy use in creating biofuels are still being developed.

Choose the most suitable word below:

The scientists looked at the ____ of energy production.

1) necessity
2) history
3) expense
4) geography

P4 computer test! :/

Answer 1

the appropriate word is necessity

Answer 2

3) expense

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