Read and write.

1. I often go           (shop) on Saturday.

2. Amy usually _       (wash) the clothes on the weekend.

3. I    ___ (listen) to music yesterday afternoon.

4. This apple is           (big) than that one.

5. What         you          last weekend?

6. I'm going to have a picnic. So I'm very         .

7. Is your box       _ (small) than mine?

8. Listen, she        _ (sing) a song.

9. My mother        _ (wash) the clothes last night.

10. I like        _ (play) basketball.

照射紫外线有可能致癌的原因是（）

A.患着色性干皮症者，缺乏切除修复功能

B.大剂量紫外线可以引起RNA破坏、蛋白变性和分解

C.大剂量紫外线可以使DNA严重受损，导致细胞的死亡

D.利用小量紫外线的促进DNA合成和细胞丝状分裂的作用

E.蛋白质分解形成的组胺，会刺激组胺酶的产生，组胺酶能够分解过多的组胺