One evening , my dad asked me to buy some bread for dinner . It was dark and cold outside . I rode a bike to a shop near my school . When I left the shop ,it got even darker , so I got on my bike right away. Then I found a woman in a white dress riding a motorcycle after me . She followed me for a long time . I rode very fast and started to cry for help, but no one was there . I was too scared and too tired to ride any faster . At last , I gave up . The woman stopped in front of me and said , “ Why were you riding so fast , Ken ?It’s dangerous !” I looked at the woman . “ Oh , It’s you, mum !You really scared me . Dad said you wouldn’t be back for dinner tonight !”

小题1:Why did Ken go out that night ?

A．To ride a bike

B．To buy some food

C．To go to cram school

D．To look for his mother小题2:Why was Ken riding fast on his way home ?

A．He was hungry

B．Someone was following him

C．It was getting darker and colder

D．His father asked him to go home soon小题3:Who was the motorcyclist (骑摩托者) ?

A．A stranger

B．A policeman

C．Ken’s father

D．Ken’s mother

IP multicasting is a set of technologies that enable efficient delivery of data to manylocations on a network．Rather than making multiple copies of a message intended to bedistributed to multiple recipients at the (71) of origin of a message，multicasting initiallysends just one (72) and does not copy it to the individual recipients until it reaches theclosest common point on the network，thereby (73) the bandwidth consumed．Networkperformance is significantly (74) because it isn’t bogged down with the processing andtransmission of several large data files；each receiving computer doesn’t have to (75) thetransmitting server for the file．

A．point
B．bottom
C．head
D．sight