3. pick out挑选出，认出，弄懂

Please pick out the books that you'd like to read. 请把你想看的书选出来。

Can you pick out your sister in this crowd？ 你能在这人群中认出你姐姐来吗？

The box was so dirty that we couldn't pick out the directions on the label. 盒子太脏，我们看不清标签上的说明。

真题：This picture was taken a long time ago. I wonder if you can ________my father. （湖北）

A. find out B. pick out C. look out D. speak out

解析：表示从人群中"辨认出"，用pick out，故选B.

4. cut off切断，割下；隔开，断绝；停止供应

Mind you don't cut your fingers off. 小心别切断手指头。

She feels very cut off living in the country. 她感到生活在乡间很闭塞。

Our water supply has been cut off. 我们断水了。

真题：He was in hospital for six months. He felt as if he was ______from the outside world. （安徽）

A. cut out B. cut off C. cut up D. cut through

解析：表示与外界"隔绝"，用cut off （from...），故选B.

5. star in 主演，在......中担任主角

She has starred in some thirty films. 她主演过大约三十部影片。

6. knock into撞上，撞见

The boy knocked into her. 那个男孩撞到了她身上。

I knocked into an old friend of mine in the park. 我昨天在公园里碰见一位老朋友。

7. bump into 碰上，偶遇，邂逅（= meet sb. /sth. by chance）

I bumped into an old friend of mine in the street yesterday.我昨天在街上遇到一个老朋友。