市场营销组合概念产生于（）年，它的决策思想吸收了大量的系统论和管理科学的系统成果。A

When very small dinosaur bones were found in a Germany mine, people thought they were from baby dinosaurs. ___小题1:_ Martin Sander's work shows that they were probably fully __小题2:__ (grow) and belong to the smallest giant dinosaur species ever found.

Growth marks on dinosaur bones are similar __小题3:__ growth rings on trees. The rings are far apart while the animal is young and growing quickly. __小题4:__ get closer as growth slows. "It is _小题5:__ (exact) these tight ring marks that we found in the fossil bones," says Sander. So the fossils must have been from adult animals.

__小题6:__ was this German dinosaur so much smaller than other giant dinosaurs, which grew up to 45 metres long and weighed as much as a thousand humans?

150 million years ago, most of Germany was underwater. Scientists think that __小题7:__ water levels rose, there was less and less land and food available. The dinosaur _小题8:__ (need) less space and food.

Since 1998, scientists have dug up more than 1,000 dinosaur fossils in the mine. It is one of the few places in the world __小题9:_ the bones and footprints of dinosaurs have been found together.

在下面的○里填上适当的符号或数

9×○＜4.536×○=57.63.45○3.45×1.157×0.1○57÷0.1．

小轿车一般都设有暗锁开关，只有闭合暗锁开关，并同时使用钥匙才能启动轿车。那么下面关于暗锁开关和钥匙开关的电路图正确的是：[ ]

A.

B.

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图所示，向试管中放入几小块镁片，把试管固定在盛有饱和石灰水（20℃）的烧杯中，再向试管中滴入约5mL盐酸，如图所示．请回答：

（1）实验中观察到的明显现象有：①剧烈反应，有气泡产生；②镁条逐渐溶解；③______．

（2）产生上述现象的化学方程式是______．