问题 选择题

如图为遗传的中心法则图解。下列有关的叙述中,正确的是

[ ]

A.①~⑤的过程中,发生碱基互补配对的有①②③④

B.能在噬菌体内发生的有①②③⑤

C.③过程中碱基互补配对时,遵循A-U、U-A、C-G、G-C的原则

D.人们利用基因工程的方法将苏云金杆菌的毒蛋白基因导入到棉花细胞内,培育出了抗虫棉。导入棉花体内的毒蛋白基因发挥作用要经过①②⑤三个过程

答案

答案:D

阅读理解

Three high students become heroes after their act of saving a baby’s life.

Andrew Willis, 15, his brother Chris, 13, and friend Reece Galea, 14, were walking along Swallow Drive on their way to school on May 23, when Nicholle Price ran out of her house, shouting for help. Her six-month-old son Corey had swallowed (吞下) an earring (耳环) and the young mother couldn’t ring for help because something was wrong with her phone. The three teenagers rushed to the aid of Ms Price, called an ambulance (救护车), calmed her down and waited with her until the ambulance arrived before heading to school.

Ms Price, Corey and his grandmother Joyce Finnie visited the school last Thursday to thank the boys for their kind action. “It’s good to know that there are still some good people who will stop and help,” Ms Price said. “While I was shouting for help, a woman walking her dog went straight past, without stopping. I don’t know what would have happened if these boys had not stopped.”

The teenagers were shocked at the attention they received at school for their heroic act but admitted that the incident was nerve-racking(刺激神经的). “We heard her shouting so we knew something wasn’t right,” Andrew said. “We thought someone had died. It was scary (惊慌的) but we just did what we had to do.”

Just as proud as the boys’ parents is their principal, Tim McCallum.

After two days in hospital, Corey has now fully recovered. “He’s got two new teeth to show,” Ms Price said. “I have to keep a closer eye on him. He’s into everything now and grabs whatever he finds to put it straight into his mouth.”

小题1:The three high students were _____ when a woman ran out of her house shouting for help.

A.playing near the house

B.on their way to school

C.walking their dogs nearby

D.on their way back from school小题2:Ms Price spoke of a woman walking her dog without stopping to show _____.

A.how dangerous the case was

B.how brave the three boys were

C.why the three teenagers’ action was heroic

D.how clever the three boys were小题3:The underlined sentence in the 4th paragraph probably means “_____”.

A.they didn’t expect they would be given so much praise

B.they felt excited to have become so famous after the incident

C.they were supposed to receive so many prizes for their good deed

D.they were proud of the attention they received at school for their heroic deed小题4: Which would be the best title for this passage?

A.How a baby was saved after swallowing an earring

B.Why the mother shouted for help

C.Baby life saved: teenage heroes earn high praise

D.A mother came to school to thank 3 teenagers

填空题