现有六种物质，选择相应物质的字母填空：

(1)____可用作厨房调味品          (2)____可用作制造飞机
(3)____被誉为“工业的血液”      (4)____是实验室最常用的燃料
(5)____是天然气的主要成分

    When we talk of plants, most of us will think of things that grow from the ground and have green leaves, but there are plants that do not look or act like other plants. Some of these belong to a special class of plants called fungi.
    Fungi may appear almost everywhere. They commonly grow in wet places where they call get food and water easily. Because fungi do not have green leaves to make their own food, but fungi must take their food from animals, other plants or water. Some fungi live on dead or rotting（腐烂的）wood, while others grow on living trees or in dirt or moss（苔藓）. Mushrooms（蘑茹）are the best-known fungi.
    There are many kinds of mushrooms appearing in all shapes and sizes. For example, cauliflower（菜花）mushrooms are found in forests from July to October．They can grow to be as heavy as fifty pounds! They grow at the foot of trees Squirrel's（松鼠）bread is another kind of wild mushroom Its appearance and use Call explain its name. These fungi look like small golden cakes Squirrels can easily eat them or carry them off to their hole to eat later.
    The mushrooms found in food stores are carefully grown by people who know they are safe to eat. People are warned never to touch of taste wild mushrooms because some of them are deadly. Even less dangerous ones cart still make a person very sick..

5月6日，四川省人民政府办公厅关于贯彻落实国务院办公厅2016年政务公开工作要点的通知（以下简称《通知》），经省政府官方网站公布。《通知》将政务公开聚焦到事关国计民生的具体项目上，再次为如何将权力置于阳光之下、减少寻租空间破题。政务公开的实施（　　）

①拓宽了民意反映渠道

②杜绝政府权力的滥用

③保障了公民的知情权

④增强了政府工作的透明度。

（2015•恩施州）2014年全球十大化学研究成果之一是复旦大学的同鸣飞教授课题组与德国柏林自由大学的Riedel教授合作，成功制备出了四氧化铱正离子（IrO₄⁺），在这种离子中，铱（Ir）元素的化合价为（  ）