[填空题]The harm the electromagnetic radiation does to people’s health is as great as or even greater than that cigarette smoking does.

[填空题]The harm the electromagnetic radiation does to people’s health is as great as or even greater than that cigarette smoking does.

[单项选择]The harm radiation has done to the Apollo crew members ______.
A. is significant
B. seems overestimated
C. is enormous
D. remains unknown

[填空题]Smog does great harm to the respiratory system.

[单项选择]Why does the speak say it may be difficult for people to love their neighbors ？（）
A. They are fully occupied with their own business.
B. Not many of them stay in the same place for long.
C. Not many of them can win trust from their neighbors.
D. They attach less importance to interpersonal relations.

[填空题]Smoking does harm to us. Under no circumstances __________________________________ (公共场所禁止吸烟).

[单项选择]Smoking does great harm to our health. ( ) is smoking allowed in public places.
A. In no time
B. At a time
C. At all times
D. At no time

[填空题]Visible light that produce warmth is an example of ______.

[单项选择]The Function of Adrenocorticotriopin Some people can quite accurately time the end of their night’’s sleep at will, without using an alarm clock, demonstrating that it is possible to voluntarily control a state of consciousness that is characterized by a loss of volition and attentional guidance. Here we show that the expectation that sleep will come to an end at a certain time induces a marked increase in the concentration of the hormone adrenocorticotriopin(促肾上腺皮质激素) in the blood one hour before waking. The regulation of adrenocorticotropin release during nocturnal sleep is therefore not confined to daily rhythms._________(46). _________(47). Normally, the release of adrenocorticotropin and cortisol(皮质醇) increases during late stages of sleeping, reaching a daily maximum at the time of spontaneous waking. Adrenocorticotropin and Cortisol are also released from the pituitary-adrenal system in a major adaptive response to stress, and are secreted in anticipation of stressful e