Example : After seeing an offensive mouthwash ad on television .I resolved never to buy that brand again.

After seeing an offensive mouthwash ad on television, I resolved never to buy that brand again.

1.Those berries are poisonous don’t eat them.

2.Our city’s buildings are not as modern as your city.

3.To get ready for the trip, all the things she needed were put into a suitcase.

4.He told me that Mary had returned home for a week.

5.I read the book on the bus which did not interest me at all.

II. Read the following passages and identify the topic sentence in each by underlining it.( 阅读以下每段文章，然后在每段文章的主题句下划线。 )20%

1.     The biggest problem in ancient DNA reserch is getting the DNA in the first place. The favorite material to work with is bone, and a small chunk of it is best. Cells can lie inside the hard bone structure waiting to be liberated after the calcium has been dissolved away. That’s the easy bit. Getting the DNA out, what little of it that remains is horrendously difficult and many teams have succumbed to pitfalls in the past. The rule is that it has to be done in a clean room better than used to assemble spacecraft to go into deep space, and it has to be done away from any other source of potentially contaminating DNA.

2.     Names usually have origins, especially for Indians. Indians with distinctive physical characteristics, might be given names such as Big Foot or Crooked Leg. If there had been a big storm on the day of a baby’s birth, the baby might have been named Thundercloud. Grey Eagle, Red-Dog, Big Bear, and Spotted Wolf are examples of Indian names after animals.

3.     Many TV commercials imply that a woman’s self-esteem depends on her cleaning ability. In one commercial, we see a woman terribly upset because her guests find spots on her glassware. Countless other commercials blur out the message that a woman will pass muster as a person if her kitchen floor gleams and her toilet bowl is blue. This idiocy must work, because the images of women scrubbing, moping, waxing and smiling keep on coming over the air.

4.     As human beings, we are constantly in the stage of change. Our bodies change everyday. Our attitudes are constantly evolving. Something we swore by five years ago is now almost impossible for us to imagine ourselves believing The clothes we wore a few years ago now look strange to us in old photographs. Everything is changing. This is a prediction I can make with absolute certainty.

5.     Electric products are closely associated with our lives. Electric alarm clocks and music pouring from our radio awaken us; we operate our roaster, brush our teeth with an electric toothbrush, and shave with an electric razor. We read today’s headlines from newspapers printed on huge electric presses, and we write a letter on our electric typewriter before leaving for work to operate a computer and word processor.