何为系统?
参考答案:
系统是相互作用、相互依赖的元素集,它是整个系统科学中最基本的概念。
小题1:My brother got ▲ (marry) last week .
小题2: I’d like to recommend this ____________ (educate) magazines to all the teachers.
小题3:When I heard the bad news , I couldn’t help ▲ (cry)
小题4: Some wild animals look fierce(凶猛的), but they are _(harm).
小题5:Buy the books now before they ▲ (sell) out .
小题6:Lily ▲ (read) a lot of books recently .
小题7:This CD can help you learn English by ▲ (test) your knowledge of English grammar
小题8: Many students use computers in their __________(day) lives.
图8 西藏对外贸易情况图
2007年与2002年相比该省出口额增加了()倍
A.2
B.2.5
C.3
D.4