单项选择题

According to information in the text, intake of carbon monoxide()

A.inhibits the flow of oxygen to the heart.
B.increases absorption of other smoke particles.
C.inhibits red blood cell formation.
D.promotes nicotine absorption.

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单项选择题
According to information in the text, intake of nicotine encourages()

A.blood circulation through the body.
B.activity of other toxins in the blood.
C.formation of blood clots.
D.an increase of platelets in the blood.

单项选择题
The greatest outcome of the discovery of the reaction principle was that A rockets could be propelled into the air. B space travel became a reality. C a major problem had been solved. D bigger rockets were able to be built.
The greatest outcome of the discovery of the reaction principle was that A rockets could be propelled into the air. B space travel became a reality. C a major problem had been solved. D bigger rockets were able to be built.
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