10．It is a tall tale that terrifies most young children．Swallow a piece of chewing gum and it will remain in your body for seven years before it is digested．Or so they say．An even worse tale is that swallowed gum can wrap itself around your heart．
But what does happen if you should accidentally eat a stick of gum？Chewing gum is made out of gum base，sweeteners，coloring and flavoring．The gum base is pretty indigestible-it is a mixture of different ingredients（成分）that our body can't use．
Most of the time，your stomach really cannot break down the gum the way it would break down other foods．However，your digestive system has another way to deal with things you swallow．After all，we eat lots of things that we are unable to fully digest．They keep moving along until they make it all the way through the gut（腸子）and come out at the other end one to two days later．
The saliva（唾液）in our mouths will make an attempt at digesting chewing gum as soon as we put it in our mouths．It might get through the shell but many of gum's base ingredients are indigestible．It's then down to our stomach muscles-which contract and relax，much like the way an earthworm moves-to slowly force the things that we swallow through our systems．
Swallowing a huge piece of gum or swallowing many small pieces of gum in a short time can cause a blockage within the digestive system，most often in children，who have a thinner digestive tube than adults-but this is extremely rare．
68．A child might feel terrified after swallowing chewing gum mainly becauseA．
A．they believe the tall tales about chewing gum
B．chewing gum will stay in their body for many years
C．their heart will be wrapped by chewing gum
D．chewing gum is indigestible for children
69．What happens to the food that can't be fully broken down？B．
A．It remains in our digestive system forever
B．It will be eventually moved out of our body
C．It will fight against the power of the gut
D．It will stick to the gut for one or two days
70．The word It （in the 4th paragraph） refers to"B"．
A．the attempt B．the salvia C．the shell D．the gum base
71．What would be the best title for text？C
A．How does our digestive system work？
B．Can chewing gum be swallowed by kids？
C．Does swallowing chewing gum matter？
D．Why swallowing chewing gum frightens kids？
分析 本文屬于說明文閱讀，作者向我們介紹了人們傳言吞食的口香糖要花七八年才能被消化，甚至還有傳言說口香糖會在你的肚子里纏繞．然而，真相是對于那些不能被人體消化的食物，消化系統(tǒng)會將它們排出體外．
解答 68．A 推理判斷題．根據文章第一段It is a tall tale that terrifies most young children．和An even worse tale is that swallowed gum can wrap itself around your heart．可知孩子們因為聽了許多關于口香糖的故事，所以會對吞食口香糖感到恐懼，故選A．
69．B 細節(jié)理解題．根據第三段They keep moving along until they make it all the way through the gut and come out at the other end one or two days later．可知那些不能被消化的食物最后會被排除體外，故選B．
70．B 詞義猜測題，根據第四段The saliva（唾液）in our mouths will make an attempt at digesting chewing gum as soon as we put it in our mouths．It might get through the shell but many of gum's base ingredients are indigestible．可知文章中的"It"指的是口中的唾液，它會幫助我們消化食物中的一些成分，故選B．
71．C 主旨大意題，通讀全文可知，本文主要針對吞食口香糖是否有危害這個問題向我們進行了解釋，澄清了口香糖會在人體內纏繞的謠言，故選C．
點評 考查學生的細節(jié)理解和推理判斷能力．做細節(jié)理解題時一定要找到文章中的原句，和題干進行比較，再做出正確選擇．在做推理判斷題時不要以個人的主觀想象代替文章的事實，要根據文章事實進行合乎邏輯的推理判斷．
