看图填词

　　Beibei is a primary school 1._____. One Saturday, he was about to go out and play when he

remembered he had to keep a 2._____as his homework. He felt unhappy and

thought," 3._____do I have to do it every day? Sometimes, there is 4._____to

write about at all. "

　　Suddenly Beibei heard a loud 5._____. "What was it?" He went to the

kitchen quickly, where the noise came 6._____, and found out what 7._____the

m atter. He was glad that he had something to write about

8._____last.

　　He quickly went to the table and started 9._____, "Mother has 10._____

another bowl (碗) today. Ha!"

1.________ 2.________ 3.________ 4.________ 5.________   

6.________ 7.________ 8.________ 9.________ 10.________

很多人可能没听过“单宁”这个词，但是一定体验过它产生的“涩味”。红葡萄酒、茶、柿子、石榴、蓝莓、坚果——大凡来自植物尝起来涩的东西，基本上就是它在作怪。植物为什么含有单宁，从进化的角度和植物生理的角度都众说纷纭。如果从结果来看，至少它对于植物是一种保护。对于哺乳动物来说，涩并非是一种享受，也就不怎么喜欢吃。另一方面，单宁本身有一定的毒性，可以杀死附着的微生物。即使是哺乳动物，吃得太多也会生病。 这段文字主要说明：

A．“单宁”是植物中含有的一种能使其变涩的物质

B．对于植物中含有单宁的原因至今尚无一致的结论

C．植物中含有单宁对植物本身而言是一种保护

D．单宁本身有一定毒性，吃得太多对健康无益