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【单选题】
为了消除( )石灰的危害,应提前洗灰,使灰浆在灰坑中( )两以上。A.
欠火，水化
B.
过火，碳化
C.
欠火，
D.
过火，
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【单选题】--- ________ you ________ to live in Qiandao Lake? --- Yes , I did. But in 2005, I came to Hangzhou with my family.
A.
Did, used
B.
Were, use
C.
Do, use
D.
Did, use
【简答题】I came to live here where I am now between Wounded Knee Greek and Grass Greek。Others came too, and we made these little grey houses of logs that you see, and they are square. It is a bad way to live, ...
【单选题】设 A = { 1,2,3,4 } , A 上二元关系 R 定义为: R ={( 1,2) ,( 2,1) ,( 2,3) ,( 3,4) }. R 的传递闭包T(R)=R ∪B. B=
A.
{(1,1),(2,2),(3,3),(4,4)}
B.
{(3,2),(4,3)}
C.
{(1,1),(2,2),(3,3),(4,4),(3.2),(4,3)}
D.
{(1,1),(1,3),(1,4),(2,2),(2,4)}
【单选题】Could I do some explanations? I ________ to call on you yesterday, but someone came to see me just when I was about to leave. [ ]
A.
had intended
B.
intended
C.
would intend
D.
was intending
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【单选题】设 A = { 1,2,3,4 } , A 上二元关系 R 定义为: R ={( 1,2) ,( 2,1) ,( 2,3) ,( 3,4) }. R 的对称闭包T(R)=R ∪B. B=
A.
{(1,1),(2,2),(3,3),(4,4)}
B.
{(3,2),(4,3)}
C.
{(1,1),(2,2),(3,3),(4,4),(3.2),(4,3)}
D.
{(1,1),(1,3),(1,4),(2,2),(2,4)}
【单选题】— You look scared. What happened? — Well , I _______ along the street ________ the UFO landed.
A.
was walking ; while
B.
is walking ; when
C.
was walking ; when
D.
is walking ; while
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