在产品纯度、产量一样的空分装置，填料塔的高度比筛板塔（）。

While having orbited the sun, the satellite has sent more than four billion bits of information back to earth.

A．orbiting

B．to orbit

C．being orbited

D．having been orbited

生活中常有些人坐上汽车后没多久就觉得头晕，上腹部不舒服、恶心、出冷汗，甚至呕吐；尤其当汽车急刹车、急转弯或突然起动时更厉害，下车休息片刻即可逐渐减轻或恢复。对于晕车的原因，下列说法正确的是( )。

A．因震动引起胃壁神经兴奋刺激胃蠕动导致
B．因左右半脑对震动的感受不平衡导致
C．因内耳前庭平衡感受器受到过度运动刺激所致
D．因车厢空气不流通，且个体对汽油味敏感所致

光分路器可以分出的光路一般有哪些（）

A.1比7

B.1比8

C.1比2

D.1比16

Watch a baby between six and nine months old, and you will observe the basic concepts of geometry being learned. Once the baby has mastered the idea that space is three-dimensional, it reached out and begins grasping various kinds of objects. It is then, from perhaps nine to fifteen months, that the concepts of sets and numbers are formed. So far, so good. But now an ominous development takes place. The nerve fibers in the brain insulate themselves in such a way that the baby begins to hear sounds very precisely. Soon it picks up language, and it is then brought into direct communication with adults. From this point on, it is usually downhill all the way for mathematics, because the child now becomes exposed to all the nonsense words and beliefs of the community into which it has been so unfortunate as to have been born. Nature having done very well by the child to this point, having permitted it the luxury of thinking for itself for eighteen months, now abandons it to the arbitrary conventions and beliefs of society. But at least the child knows something of geometry and numbers, and it will always retain some memory of the early happy days, no matter what vicissitudes it may suffer later on. The main reservoir of mathematical talent in any society is thus possessed by children who are about two years old, children who have just learned to speak fluently.

Which of the following conclusions is supported by the passage().

A. Preschool education should stress society’s beliefs and conventions.

B. The language concepts used in early education interfere with mathematical reasoning.

C. Language teaching should incorporate some mathematical formulas.

D. It is hopeless to try to teach children mathematics after the age of two.

EAN码的缩短码是在较小的商品上采用（）缩短数字码。

A.7位

B.8位

C.9位

D.10位