阅读下面课文段落，按照句子结构的语法性和上下文的连贯要求，空格处各填入一个适当的单词，使短文通顺完整。请将答案写在二卷答题纸上。

◣ A ◢

(Book 4 Unit 2  Working the land)

Although he is one of China’s most famous scientists, Yuan Longping considers himself a farmer, for he works the land to do his research. Indeed, his sunburnt face and   小题1: and his slim, strong body are just like those of millions of Chinese farmers, for whom he has   小题2:  for the past five decades. Dr Yuan Longping grows what is called super hybrid rice.   小题3:  1974, he became the first agricultural pioneer in the world to grow rice that has a high   小题4:. This special strain of rice makes it possible to produce one-third more of the   小题5:  in the same fields. Now more than 60% of the rice produced in China each year is from this hybrid strain.

◣ B ◢

(Book 4 Unit 5  Theme parks)

The theme park you are probably most familiar with is Disneyland. It can be found in several   小题6:  of the world. It will bring you into a magical world and make your dreams come   小题7: , whether traveling through space, visiting a pirate ship or meeting your favourite fairy tale or Disney cartoon character. As you   小题8: around the fantasy amusement park, you may see Snow White or Mickey Mouse in a parade or on the street. Of course Disneyland also has many exciting rides, from giant   小题9: ships to terrifying free-fall drops. With all these attractions, no wonder tourism is increasing wherever there is a Disneyland. If you want to have   小题10: and more than fun, come to Disneyland!

脑灌注压发生变化时机体仍能保持脑血流相对恒定的现象称为脑血流的自身调节。下列哪种情况不改变脑血流的自身调节（）。

A.慢性高血压

B.正常患者平均动脉压在60～140mmHg的范围内变化

C.PaCO₂升高

D.PaO₂降低

E.脑组织酸中毒