Question

阅读理解： 　　Your blood makes a round trip through your body in less than a minute, thousands of times a day．It travels through tubes called blood vessels．There are three main kinds of blood vessels－arteries, veins, and capillaries(毛细血管)．When blood is pumped out of your heart it goes into your largest arteries．These branch into smaller arteries, which branch into still smaller ones．The blood flows from the smallest arteries into your capillaries． 　　Capillaries are bridges between your arteries and your veins．They are the tiniest blood vessels, so small that you cannot see them without a microscope．Blood travels from the capillaries into tiny veins．These lead to larger and still larger veins．Finally, the largest veins take the blood back to your heart． 　　Blood feeds your cells, cleans them, and works to keep them healthy．It carries food and oxygen to every cell of your body．The food and oxygen get into your cells by passing through the thin walls of your capillaries． 　　Blood cleans all your cells by picking up wastes from them．The wastes pass from your cells, through the capillary walls, into your blood．The wastes called urea and uric acid are carried by the blood to your body and urine．The waste gas called carbon dioxide is carried by the blood to your lungs．It leaves your body when you breathe out． 　　Blood also protects you．It has special cells in it that fight germs．The cells in your blood that fight germs are called“white cells”．These are like an army for your body．They kill harmful germs that get into your blood．When a large number of germs enter your body, the number of white cell“soldiers”grows．A lot of blood moves to the area where the germs are．The white cell soldiers attack the germs and kill them．The used white cells and dead germs form the thick yellow liquid called pus．If the pus is inside a sore on your skin, it may leak out． (1) How many round trips may your blood make through your body a day? [　　] A． 500 times． B． 1 000 times． C． 1 440 times． D． 1 500 times． (2) How does blood travel around your body? [　　] A． arteries-capillaries-veins B． capillaries-veins-arteries C． veins-capillaries-arteries D． capillaries-arteries-veins (3) Which one is TRUE? [　　] A． Blood can only protect you． B． All the cells in the blood can fight germs． C． Carbon dioxide leaves your body when you breathe out． D． The food and oxygen can pass through the capillaries, but wastes can’t． (4) Which topic isn’t mentioned in the article? [　　] A． How does blood travel around your body? B． Why do you need blood? C． How do your special blood cells fight germs? D． What are germs?

Answer 1

答案：1．D;2．A;3．C;4．D;
解析：

(1)	这是一道数据计算题。根据短文首句Your blood makes a round trip through your body in less than a minutes，先按每分钟血液在人体内循环一次，一天共循环60×24＝1440(次)，但是该句是说人体内的血液不到一分钟循环一次，所以D项最佳。
(2)	这是一道排列顺序题。做此题需要综合文中两处信息。第一处是短文第一段中When blood is pumped out of your heart it goes into your largest arteries，及The blood flows from the smallest arteries into your capillaries，第二处是短文第二段中Blood travels from the capillaries into tiny veins，综合这两处信息，可判断出A项正确。
(3)	这是一道正误辨认题。文中信息比较明显，根据短文第四段中The waste gas called carbon dioxide is carried by the blood to your lungs．It leaves your body when you breathe out，可做出正确判断。
(4)	该题考查对文中提供信息的准确掌握情况。短文最后一段提及在血液里有一种叫做白细胞的特殊细胞能够对病菌斗争并杀死有害的病菌，但并未说明病菌是什么。