1.The condition prevents blood from c freely.
答案:circulating
2.There will be an i of 20 minutes after the second act.
答案:interval
3.Some books are to be d ,others to be swallowed,and some few to be chewed and tasted.
答案:digested
4.The m resources in the area are abundant.
答案:mineral
二、用方框内所给单词的适当形式填空
oxygen pump through circulate
—This organ beats at regular intervals 100,000 times a day.With each beat,it 1. 80 ml of blood 2.
the body — that’s 8,000 litres of blood per day!It 3. blood into the lungs,where it receives 4. ,before being pumped around the rest of the body.What do you think it is?
—I think it is a heart.
答案:1.circulates 2.through 3.pumps 4.oxygen
