单项选择题

Questions 11 to 18 are based on the conversation you have just heard.

A．Commenting on a picture.
B．Looking at some paint.
C．Painting a picture.
D．Comparing two paintings.

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Fruits, such as watermelon, red grapefruit, and guava, are now exciting the interest of researchers because______.

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Calcium -rich food______its supplements because it also provides other nutrients like vitamin D and other minerals.

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