D.It can produce natural fibers.
解析:推理判断题。根据第三段The silk itself has an ability to soften or stiffen to bear different types of loads—unlike any other natural or manmade fibers可推断,答案为A项。
答案:A
3.What do we know about the first type of spider silk?
A.It is stiff and thin.
B.It is gentle and dry.
C.It acts as a basic frame of a web.
D.It is used to create threads.
解析:推理判断题。根据末段The first is stiff and dry and it is used in threads which spread out from the centre可推断,第一种蜘蛛丝在网里被用来做基本的构架,故答案为C项。
答案:C
4.The underlined word“viscid”in the last paragraph probably means“______”.
A.short and thick
B.thick and sticky
C.weak and dry
D.long and sticky
解析:词义猜测题。根据末段The second is stickier...和...create the spiral threads which are mainly used to trap food可推断,答案为B项。
答案:B
B
The evidence of habitation in the Yampa River Valley goes back more than 10,000 years when prehistoric people lived and hunted in this region.However,in modern times,it is generally agreed that the oldest residents(居民)were the Utes(犹特人)whose land once extended from the north of New Mexico to the Green River in Wyoming.They hunted and gathered food in small groups and the groups that lived in the Yampa Valley were referred to as the“Yamparika”Utes.They were named after the Yampa plant which was part of their regular diet and is similar to a carrot.Many hot springs in the area are silll regarded as sacred(神圣的)by the Utes.
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