2010年职称英语《理工类B级》考点精粹四(14)

词汇:

backpack/5bAkpAk/n.背包 watt/wCt /n.瓦(特)
receiver/ri5si:vE(r)/n.接收机 gait/eit/n.步态，步法
night-visiongoggle 夜视镜 oscillation/7Csi5leiFEn/n.摆动
spring/spriN /n.弹簧 commercialize/kE5mE:FElaiz/v.商业化
vertical/5vE:tikEl /adj.垂直的 mountaineer/7maunti5niE(r)/n.登山运动员
rotary/5rEutEri /adj.旋转的

练习：

1. Backpacks are convenient because

A they can be verylarge.
B they can hold as many things as you want to carry.
C your handsare freed to do other things.
D you do not have to carry things withyou.