更多"The climate of earth has fluctuated"的相关试题:
[单项选择]The climate of earth has fluctuated quite a bit over the last 4.6 billion years of our planet’s history and it can be expected that the climate will continue to change. One of the most intriguing questions in earth science is whether the periods of ice ages are over or arc we living in an "interglacial" period of time between ice ages
The geologic time period we are now living in is known as the Holocene (全新世). This epoch began about 11,000 years ago which was the end of the last glacial period and the end of the Pleistocene (更新世) epoch. The Pleistocene was an epoch of cool glacial and warmer interglacial periods which began about 1.8 million years ago.
Since the glacial period known as the "Wisconsin" in North America and "Wrm’ in Europe when over 10 million square miles (about 27 million km2 ) of North America, Asia, and Europe were covered by ice, almost all of the ice sheets covering the land and glaciers in the mountains have retreated. Today, about ten p
A. Has the Pleistocene Epoch Ended
B. Another Ice Age in the Geologic Future Is Coming
C. The Ice Ages: Are They Over
D. Glacial Ice Will Be Present in Different Places
[简答题] College costs vary quite a bit, depending upon the type of school attended. For example, at many of the more expensive private schools, (47)______ costs (including tuition, room, board, books, travel to and from home, and other expenses) may (48)______ $20,000. Of course, public universities are much cheaper. At these schools, tuition is (49)______ higher for out-of-state students than it is for those whose (50)______ residence is within that state. Tuition at community colleges (51)______ about half the in-state cost of public, four-year colleges and universities.
For those that cannot afford the cost of a college education, (52)______ aid is the answer. Students in the U.S.A. receive about $20 billion per year in financial aid. In recent years, nearly 75% of students in postsecondary programs have been receiving some form of financial aid. There are three main types of financial aid: (a) (53)______ (grants), which are gifts that students do not repay; (b) (54)______ to stude
