一座长方体花岗岩石碑，质量为4.2×10³kg，底面积为0.5m²（g取10N/kg）.求：

甲、乙是染色体数目相同的两种二倍体药用植物，甲含有效成分A，乙含有效成分B．某研究小组拟培育同时含有A和B的新型药用植物．回答下列问题：

（1）为了培育该新型药用植物，可取甲和乙的叶片，先用____酶和____酶去除细胞壁，获得具有活力的____，再用化学诱导剂诱导二者融合．

（2）形成的融合细胞进一步培养形成____ 组织，然后经过____ 形成完整的杂种植株．这种培育技术称为____ ．

（3）上述杂种植株属于多倍体，多倍体是指____ ．假设甲与乙有性杂交的后代是不育的，而上述杂种植株是可育的，造成这种差异的原因是____ 

（4）这种杂种植株可通过制作人工种子的方法来大量繁殖，经植物组织培养得到的____等材料用人工薄膜包装后可得到人工种子．

英国小姑娘____凭借海啸前的预兆知识挽救了全体人员的生命。

善良要付诸行动，表现在（  ）

①对需要帮助的人给予力所能及的帮助    ②关怀和体贴别人，为别人的需要作出贡献

③体验生命的快乐                                        ④为了得到某种回报，去做一些看上去善良的事

阅读短文，从短文下面方框中的六个句子中选择五个还原到短文中，使短文通顺完整、衔接自然．

    In Australia there is a famous island called Fraser Island．A great many visitors come here for holidays every year．Why？The reason is that it is special．____．In fact，it is the largest sand island in the world．It's about 200 kilometers long and 240 kilometers wide．

    Though the island is a popular place of interest，there is no airport on the island．The long beach along the east coast works as the airport．____．

    On the island there are sand hills without any plants，but there are forests with old trees，beautiful flowers and over a hundred lakes，too．____．

    Every year，visitors come to enjoy the island's natural beauty．People like camping and hiking there．____．Animals were killed for food and this made them in danger of extinction （灭绝）．They threw rubbish everywhere，and the lakes were seriously polluted．

    ____．Rules have been set up．For example，visitors are not allowed to use motorboats （摩托艇） or go fishing in the lakes，and they mustn't leave any rubbish．

A．Planes arrive and leave from here

B．Anyone who breaks the rules w il be pun i shed

C．The island s completely made of sand

D．Unluckily，visitors have caused many problems

E．Many kinds of birds and animals live in the forest

F．So it is time to protect the environment of the island．