久未谋面的老同事刘某从外地来访，黄某挽留刘某在家居住。某日，黄某偶然撞见刘某正注射毒品，颇感震惊，但碍于面子，没有制止。两天后，警察在刘某房内搜出毒品和注射用具，刘某也承认自己注射毒品。警察带走刘某，并对黄某处以3日拘留。根据《禁毒法》，黄某受拘留处罚的原因是( )。
A．他包庇贩卖毒品的刘某
B．他容留刘某吸食注射毒品
C．他阻碍依法进行毒品检查
D．他为刘某窝藏毒品
参考答案：B
解析：《禁毒法》第六十一条规定，容留他人吸食、注射毒品或者介绍买卖毒品，构成犯罪的，依法追究刑事责任；尚不构成犯罪的，由公安机关处10日以上15日以下拘留，可以并处3 000元以下罚款；情节较轻的，处5日以下拘留或者500元以下罚款。
| Lichens may grow on the bark of a tree in a steaming tropical rain forest, on the bricks of big city buildings, on rocks in hot springs, on wind-swept mountaintops, and in the driest desserts. In the arctic, they provide the principal food for caribou, and they are one of the few plants that grow in Antarctica. They are pioneers, appearing in barren rocky areas and starting the formation of soil in which mosses, then ferns, and then other plants can take root. Lichens are a partnership of two plants — fungi and algae. The lichen body is made up of a network of fungal strands. In the upper layers of these grow groups of algae. The two organisms live together to the benefit of both, a relationship known as symbiosis. The fungi provide support, absorb water, and shelter the tender algae from direct sunlight. The algae carry on photosynthesis and provide the fungi with food. The algae can live independently and are recognizable as a species that grows alone. The fungi, on the other hand, cannot live apart from their partners. They can be placed in known classes of fungi but are unlike any species that lives independently. So definite are the form, color, and characteristics of these double organisms that for hundreds of years, they were classified as one. More than 15,000 "species" were named. If these organisms are classified as separate species, it is difficult to fit them into the existing system of classification. But if they are classified separately, these species of fungi seem rather strange. Lichens are a splendid example of the difficulties faced by taxonomists in classifying species. |
Why does the author call lichens pioneers
A．Because they developed so early in the history of the planet.
B．Because of their primitive structure.
C．Because they prepare soil for other plants.
D．Because they were the first plants to live in Antarctica .