Tim first mether_______a summer evening.

以关键字序列（tim,kay,eva,roy,dot,jon,kim,ann,tom,jim,guy.amy)为例，手工执行以下排序算法（按字典序比较关键字的大小)，写出每一趟排字结束时的关键字状态! （1)直接插入排序:（2)冒泡排序:（3)直接选择排序: （4)快速排序:（5)归并排序:（6)基数排序。

It was the first time that such a had to be taken at a British nuclear power station.

A) presentation B) preparation C) prediction D) precaution

Before the first non-stop flight made in 1949, it ________ necessary for all planes to land for refueling.

A) would be B) has been

C) had been D) would have been

A.the Song Dynasty

B.the Qin Dynasty

C.the Ming Dynasty

D.the Qing Dynasty

m of pollution in the country, but halfway in her speech, she suddenly _________ to another subject.

A) committed B) switched

C) favoured D) transmitted

ination so that she could be sure of passing it on her first ____________.

A) intention B) attempt

C) purpose D) desire

A.circular note

B.check

C.coupon

D.bond

A.original

B.first

C.before

D.p ast

It was the first time that such a ______had to be taken at a British nuclear power station.

A) presentation B) precaution C) preparation D) prediction v

A.begin

B.is beginning

C.beginning

D.begins