#### 题目列表

Approximately what percent of the families in the sample own more than 3 motor vehicles?
How many of the families own exactly 2 motor vehicles?
If a family were selected at random from the survey sample, what is the probability that the family would own more than 2 motor vehicles?
If $3^{x}$+$3^{x}$+$3^{x}$ = $9^{x-2}$, what is the value of x?
Each digit of a 20-digit number is either a 1, 2, 3, 4, or 5. If the average (arithmetic mean) of 15 of the 20 digits of the number is 2.8 and if M is the average of all 20 digits of the number, then M must satisfy which of the following inequalities?

The frequency distribution above summarizes the numbers of minutes, rounded to the nearest integer, that 46 students individually spent studying for an exam. Based on the information given, which of the following statements must be true?

Indicate all such statements.
The operation △ is defined by r△s=12$r^{-1}$(s+3) for all positive numbers r and s. If x△3=18, what is the value of x?
In the nineteenth century, geology became so respected among middle-class Britons that the science came to be seen as ______ , a yardstick by which other disciplines measured their scientific rigor and imaginative power.
The movie has a surfeit of inscrutable characters and tortuous subplots, so it is no surprise that viewers appeared _____ .
Seemingly to compensate for the (i)_____nature of her subject, in her review the theater critic (ii) _____ a casual chatty style.
Defying expectation, the electorate seems poised to (i)_____a number of political tenets so(ii) ______ that they are often paraded as fact.
Some critics claim that because medical journals receive (i)_____selection of findings from clinical trials--mainly those trials that show (ii) ______ results for the drugs being tested--readers of those journals believe that some medications are more(iii)_____ than they really are, even when those medications are little more than placebos.
Among chess aficionados, there have been many doomsday scenarios about people (i)______ the game as a result of the superiority of computer chess programs over human players. Others have replied to this with variations on the theme of how we still hold footraces despite cars going much faster, but this analogy is (ii)______since cars do not help humans run faster while chess computers undoubtedly have an effect on the(iii)______ of human chess.
The tools of science are so specialized that we accept them as a kind of ______machinery for producing knowledge: we know that they work, but cannot explain why.
If satellite images predicting outbreaks of Rift Valley fever in the Horn of Africa were to lead to vaccination campaigns five months in advance, monitoring of such images could potentially ______ epidemics in both livestock and people.
The rebellion was ______one, driven less by ardor than by reason and calculation.
To say that John Adams was forthright was to be_____ ; friends as well as enemies were more likely to characterize his stark honesty and direct manner as blunt and awkward.
New Zealands lesser short-tailed bat, Mystacina tuberculata, is one of only two bat species to use a true walking gait when maneuvering on the ground. It has been assumed that the specialized terrestrial habits of mystacinids evolved in New Zealand following their isolation there. Absence of native terrestrial mammalian predators in New Zealand has been hypothesized to have facilitated evolution of terrestriality. However, although it is likely that terrestrial foraging by extant Mystacina tuberculate makes it vulnerable to introduced mammalian predators, there is as yet limited available data on the actual risk of terrestriality. Indeed, Lloyd argues that although some individuals may be caught on the ground, generally they would not be easy prey: they are cryptic, fast-moving, with acute hearing and olfaction, and can quickly take flight.
The passage is primarily concerned with
Which of the following can be inferred from the passage about Mystacina tuberculate?

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