5.What ithe main idea of the last paragraph
A.Plants can, easily adapt to climate change.
B.Scientists are makin to save plants.
C.Cimates change is a great threat to plants.
D.Plants are developing new stregies to survive.
—5、BDADC
阅读下列短文, 从给的四个选项 (A、B、C和D) 中, 选出最佳选项。
(2017·合肥市二模,D)
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. 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 absorb.
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 (肠子) and come out at the other end one or
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