更多"Life on land probably (11) about "的相关试题:
[填空题]Life on land probably (11) about 430 million years ago，though it has existed in the water for perhaps (12) 3,000 million years．When we think of the first life on land，we probably think of some (13) animals coming out of the oceans，but (14) ，no animals could have been living if plants had not been on land first．Plants had to be on land before animals arrived．They (15) the first land animals with food necessary to live．since they the plants are the only form of life that is able to get and store energy．
[单项选择]
Life on land probably began about 430 million years ago, though it has existed in the water for perhaps much as 3 000 million years. When we think of the first life on land, we probably think of strange animals coming out of the oceans, but, in fact, no animals could have been living if plants had not been on land first. Plants had to be on land before animals arrived. They supplied the first land animals with the surrounding and food necessary, since the plants are the only form of life that is able to get and store energy.
The first plants to exist out of the water were probably certain kinds of algae (海藻) which were followed by other plants that grew close to the ground and needed water in which to reproduce. Once their move to land had been made, however, evolution (进化) took place quickly. By the end of 100 million years, plants had developed their roots (根), and some had got tree-like forms since height was very important in gaining sunlight. About 300 million years
A. life on land probably began about 430 years ago
B. the first animal on land came from oceans
C. there wouldn’t be animals without plants
D. plants are the only form of life that is able to get and store energy
[单项选择]The single most shattering statistic about life in America in the late 1990s was that tobacco killed more people than the combined total of those who died from AIDS, car accidents, alcohol, murder, suicide, illegal drugs and fire. The deaths of more than 400, 000 Americans each year, 160, 000 of them from lung cancer, make a strong case for the prohibition of tobacco, and particularly of cigarettes. The case, backed by solid evidence, has been made in every public arena since the early 1950s, when the first convincing link between smoking and cancer was established in clinical and epidemiological studies—yet 50 million Americans still go on smoking. tobacco-related illness. It is a remarkable story, clearly told, astonishingly well documented and with a transparent moral motif.
Most smokers in America eventually manage to quit, and local laws banning smoking in public have become common, but the industry prospers. The tobacco companies have survived virtually everything their opp
