题目

用括号内所给单词的适当形式填空。 1.Our teacher gave us a lot of__________(help)books on math. 2.Most__________(leaf)on the trees turn yellow in fall. 3.The sick man came to Beijing for better __________ (medicine)treatment. 4.His________(pronounce)has improved,but he still does much practice every day. 5.The policemen that lost their lives in the earthquake are___________(hero)in my heart.手足口病主要是由肠道病毒引起，传播快，多在夏、秋季节流行，主要通过消化道传播，呼吸道飞沫、接触也可传播。(1)手足口病患者感染的肠道病毒，从传染病的角度来说，它属于________；从免疫的角度来说，它属于_________。(2)肠道病毒EV71型传染病患者康复后可获得对该病毒的免疫力。原因是体内产生了__________，这种免疫属于_________免疫。(3)为预防手足口病的传播，请你为此病高发区的居民提出两条预防该传染病的可行性措施：________________。