【单选题】Meteorites are slowed down by Earth’s atmosphere, but if they are moving （）, they can form a crater on impact.
A. enough fast
B. fast enough
C. so fast enough
D enough are fast
A. enough fast
B. fast enough
C. so fast enough
D enough are fast
【单选题】
单项选择
单项选择
【分析解答题】LISTENING 5类型：Lecture话题：Biology详细内容：本篇是讨论有关动物迁徙的讲座。Professor说动物迁徙不像人类就是为了comfortable，人在冬天跑去佛罗里达去了，有个小姑娘做了一个研究关于蜻蜓的迁移路线，然后说这个实验有待进一步研究证实，这个蜻蜓到处飞，然后有一堆飞到了印度洋的小岛上，但这个蜻蜓为什么不会被风吹，那个季节的风是和他们的飞行线路相反的，因为他们飞的特别高，高处风向反过来了，所以他们就飞到了岛上，但是岛上没有淡水，蜻蜓要淡水生育，然后说是靠雨水形成的短暂小水坑繁殖，这些虫子飞来飞去是为了寻找一片奇怪的不知道是啥的东西，总之到哪那就下雨，他们就可以生育了，然后谁这蜻蜓到处飞，这样从印度飞到非洲去了，然后又飞回来了，这个过程中要四代蜻蜓才能完成，然后说过去认为大王蝶是飞的最远的昆虫，如果这是真的话，那么就会颠覆这个观点。
【单选题】 What is the purpose of the honeybee dance
A．( To determine the quantity of food at a site
B．( To communicate the location of food
C．( To increase the speed of travel to food sources
D．( T identify the type of nectar that is available
A．( To determine the quantity of food at a site
B．( To communicate the location of food
C．( To increase the speed of travel to food sources
D．( T identify the type of nectar that is available
【单选题】 constituting one of the earliest engineering techniques, __________ in Paleolithic time was done in order to extend natural caves.
A．( tunnels were built
B．( which built tunnels
C．( the building of tunnels
D．( tunnels whose building
A．( tunnels were built
B．( which built tunnels
C．( the building of tunnels
D．( tunnels whose building
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