C．They help chocolate to dissolve more quickly.

　　D．They destroy the surface of the teeth.

　　二、任务型读写

　　阅读下面短文，根据所读内容在表格中的空白处填入恰当的单词。注意：每个空格只填一个单词。

　　Your blood makes a round trip through your body in less than one minute thousands of times a day. It travels through tubes called blood vessels.There are three main kinds of blood vessels—arteries，veins(静脉)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 can not 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 each cell of your body.The food and oxygen get into 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 our 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.

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