眼球里具有感光功能的结构的是                          （    ）

A．视网膜

B．巩膜

C．脉络膜

D．角膜

用所给词的适当开式填空

 1. A cat has four _______( foot).

2. There are not any new word in the_______(nine)lesson.

3. It's important                _______(learn) the language.

4. Gina often_______(carry) the little girl after school.

5. I felt_______(tire) after a long walk.

6. Junk food is not good for you.  You should_______( eat)healthy food.

7. It's easy                _______(write) an E-mail.

8. His brother enjoys_______(drink) milk,  but he likes juice.

9. Two hours ago, she   ______(meet) her art teacher on the street.

10. You may   ______(go) there early next time.