题目内容
（请给出正确答案）
The elaboration in the last but one paragraph concerns______.
A．one drag on the development of triathlon
B．the rapid supplant of triathlon
C．one notion advanced by Chris Brasher
D．the emergence of overwhelmingly white and middle class
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更多“The elaboration in the last bu…”相关的问题
The most important development, however, is a non-event: the collapse of global capitalism has not occurred. Instead, the post-crisis world is likely to be even more market-oriented than the one that preceded it, with a proliferation of new rules and practices that will help markets to operate more smoothly. The countries recovering best, such as Thailand and South Korea, are doing so by moving further in a free-market direction. None of the affected nations has tried to isolate itself from the global economy, and the widely feared worldwide wave of protectionism has not yet materialized.
Nor has there been the great rethinking of economic globalization that some feared and others advocated. The critics of global capitalism pounced on the crisis as proof of globalization's fatal flaws. Their analyses often concluded that "there must be something better." On the contrary, economists have taken free-market principles as the starting point for new ideas, not called them into question.
There has been much criticism of the so-called Washington consensus—the traditional free-market orthodoxy that uniformly prescribes fiscal discipline, deregulation, and financial liberalization. Partly as a result of the crisis, a new consensus simply adds extra prescriptions—such as better financial supervision, labor market, etc.—to the list. It is an elaboration of the original consensus, not a new departure.
Numerous studies also show that engagement in the global economy leads to higher growth and helps to reduce poverty in developing countries. Today's economic arguments are not over fundamental free-market policies, but what must be done to supplement them. Likewise, the efforts to devise a new "international financial architecture" in the wake of the crisis, due to continue during the spring meetings of the World Bank and the International Monetary Fund in Washington, will not involve rebuilding the system from scratch. The aim is to make incremental improvements in financial rules and practices that will oil the wheels of the market system, not to trade it in for a non-existent new model.
What is the main idea of the first paragraph？
A．After the severe Asian Financial Crisis, the world economy began to recover.
B．Asian Financial Crisis is as devastating as a neutron bomb and causes great damage.
C．There are still direct and indirect impacts so that the economy cannot recover.
D．The direct impact of Asian Financial Crisis has gone.
Pheromones are substances that serve as chemical signals between members of the
same species. They are secreted to the outside of the body and cause other individuals
of the species to have specific reactions. Pheromones, which are sometimes called
line "social hormones," affect a group of individuals somewhat like hormones do an individual
(5) animal. Pheromones are the predominant medium of communication among insects
(but rarely the sole method). Some species have simple pheromone systems and produce
only a few pheromones, but others produce many with various functions. Pheromone
systems are the most complex in some of the so-called social insects, insects that live
in organized groups.
(10) Chemical communication differs from that by sight or sound in several ways.
Transmission is relatively slow (the chemical signals are usually airborne), but the
signal can be persistent, depending upon the volatility of the chemical, and is sometimes
effective over a very long range. Localization of the signal is generally poorer than
localization of a sound or visual stimulus and is usually effected by the animal's moving
(15) upwind in response to the stimulus. The ability to modulate a chemical signal is limited,
compared with communication by visual or acoustic means, but some pheromones may
convey different meanings and consequently result in different behavioral or physiological
responses, depending on their concentration or when presented in combination. The
modulation of chemical signals occurs via the elaboration of the number of exocrine
(20) glands that produce pheromones. Some species, such as ants, seem to be very articulate
creatures, but their medium of communication is difficult for humans to study and
appreciate because of our own olfactory, insensitivity and the technological difficulties
in detecting and analyzing these pheromones.
Pheromones play numerous roles in the activities of insects, They may act as alarm
(25) substances, play a role in individual and group recognition, serve as attractants between
sexes, mediate the formation of aggregations, identify foraging trails, and be involved in
caste determination. For example, pheromones involved in caste determination include
the "queen substance" produced by queen honey bees. Aphids, which are particularly
vulnerable to predators because of their gregarious habits and sedentary nature, secrete
an alarm pheromone when attacked that causes nearby aphids to respond by moving away.
What does the passage mainly discuss？
A．How insects use pheromones to communicate
B．How pheromones are produced by insects
C．Why analyzing insect pheromones is difficult
D．The different uses of pheromones among various insect species
已知f1(t)=tε(t)，f2(t)=ε(t)一ε(t一2)，求y(t)=f1(t)*f2(t一1)*δ’(t一2)。
求下列函数的卷积积分f1(t)*f2(t)： (1)f1(t)=tε(t),f2(t)=ε(t)； (3)f1(t)=f2(t)=e-2tε(t)； (5)f1(t)=tε(t)，f2(t)=e-2tε(t)； (7)f1(t)=ε(t)一ε(t一4)，f2(t)=sin(πt)ε(t)； (9)f1(t)=tε(t一1)，f2(t)=ε(t+3)；
，则t=（）。
