小题1:This summit produced a _____________ (突破) in the relations between the two countries.

小题2:It looks ___________ (完美的) on you.

小题3:Science ___________ (小说) is often about things that we believe may be possible in the far future.

小题4: Oil has a density lower than 1000 kg/m³,so it will ______ (漂浮) on water.

小题5:They are famous as the ___________ (自由) fighters.

小题6:The plane is now flying at an ________ (海拔，高度) of 30,000 feet.

小题7: The last day of Kwanzaa is marked by a __________（盛宴）, where a lot of people enjoy a big meal.

小题8:Segregation eventually disappeared and a new _________ (黎明)seemed to arrive.

小题9:The pains of slaves were brought from Africa by ___________ (贪婪的) slave traders.

小题10:The police ________ (逮捕) a black woman who refused to give her seat to a white man.

三色VASI在夜间的正常有效范围是多少？