Today’s nuclear fission fuels are the remnants of which used to be a much more active mixture of radioactive and fissionable materials two billion years ago and earlier

Câu hỏi liên quan

• To save the California condor from extinction, a group of federal, local, and privately organizations initiated a rescue program.

• Choose the correct answer to complete the sentence. "Global warming occurs ______ the greenhouse gases in the atmosphere trapthe heat from the sun."

• The pleura that cover the exterior of the lungs and the inner walls of the chest cavity is a thin elastic membrane.

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• Muscles are essentially made up by elastic fibers that lend flexibility to the body

• According to most psychological studies, body language expresses a speaker’s emotions and attitudes, and it also tends to affect the emotions and attitudes of the listen.

• Learners can feel very ...... if an exercise is too difficult.

• It is necessary that the director will sign all the copies, not just the top one

• As the marathon runner reached the half-way mark, he, being hot and was soaked with perspiration, stopped to rub himself down with a towel.

• I think he will come here, _    ?

• A great aviation pioneer, Amelia Earhart was already famous when she sets out on her ill-fated attempt to circle the globe in 1937’s

• Often a headache is caused by the contraction of one of the muscle group that cover the skull, thus causing spasm and pain.

• Choose the best option:

  The____ is the air, water and land in or on which people, animals and plants live.

• If the water level has raised a little higher, the dam would probably have broken

• Most sand dunes are always in motion as wind pushes sand upward one side of each dune, over the top, and down the other side.

• It is estimated that about 640 women remain illiterate in ............ world, mostly in developing countries. 

•  Scientists sent ............ expedition to ............ Mars during .......... 1990s. 

• I haven’t decided yet about either to buy a new car or second-hand one

• Deciduous trees are ones that lose its leaves in the autumn and grow new ones in the spring.

• The purpose of traveler’s checks is to protect travelers from theft and accidental lost of money.

• Mr. Smith is going to buy a new Japanese car, doesn’t he ?