用be动词的适当形式填空。

1. I ______________ Xiao Ming. I ______________ nine years old.

2. Dick ______________ a singer.

3. Excuse me, ______________ you a teacher?

4. Tom and Lucy ______________ good friends. They ______________ in the same class.

5. What day ______________ it today?

6. It ______________ not a penguin (企鹅).

7. These boxes ______________ too heavy for me.

8. There ______________ a tree on the hill.

9. There ______________ many birds in the sky.

10. My name ______________ Martin. I ______________ from Australia.

关于多形性日光疹，叙述正确的有（）。

A.病因不清，主要与遗传、环境、免疫等因素有关

B.临床以斑块型最常见，其次为丘疹型和丘疱疹型

C.PMLE与其他光敏性疾病如日光性痒疹和慢性光化性皮炎部分重叠

D.可伴发风湿性关节炎和白癜风

E.预防首先在于避光。多数轻症患者，避光和使用广谱遮光剂和保护性服装能消除或减轻症状。但中至重度PMLE患者，根据其发病频率、持续时间、严重程度和生活限制的程度，选择个性化治疗方案