IR-OG12：6-10 练习册详情

1

A car is travelling on a straight stretch of roadway. And the speed of the car is increasing at a constant rate. At time 0 seconds, the speed of the car is v0 meters per second; 10 seconds later, the front bumper of the car has traveled 125 meters and the speed of the car is v10 meters per second.

In the table, select values of v0 and v10 that are together consistent with the information provided. Make only two selections, one in each column.

V0	V10
		5
		18
		20
		36
		72

164人做过此题 平均耗时为2min54s 平均正确率为 40%

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2

Journalist: the end of the Triassic, the geologic period that extended form about 250 to 200 million years ago, has traditionally been blamed on volcanic eruptions that went on for 600,000 years. However, a researcher has recently suggested that these eruptions were only an indirect cause. By analyzing the isotopic composition of hydrocarbon molecules from plant waxes from the period, he discovered what looks like a spike in the amount of nonbiological carbon in the atmosphere, lasting between 10,000 and 20,000 years. The researcher believes that the release of methane—a carbon-containing greenhouse gas much stronger than carbon dioxide—stored at the bottom of the ocean was the direct cause of the end of the Triassic.

The journalist suggests that a certain causal sequence may have brought about the end of the Triassic period. Identify in the table the sequence of cause and effect most strongly suggested by the journalist to have resulted in the end of the Triassic. Make only two selections, one per column.

Cause	Effect
		The emissions of volcanoes into the atmosphere
		The extinction of many oceanic biological species
		The eruption of volcanoes
		The release of carbon dioxide into the atmosphere
		The release of methane from the bottom of the ocean

93人做过此题 平均耗时为1min25s 平均正确率为 9%

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3

For each positive integer n, the quantity $S_n$ is defined such that $S_{n+2}=(S_n)^2-S_{n+1}$. In addition, $S_2=1$ .

In the table, select values for s1 and s4 that are jointly compatible with these conditions. Select only two values, one in each column.

S4	S1
		-12
		-7
		-3
		-1

34人做过此题 平均耗时为19s 平均正确率为 18%

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4

In the experiment, researchers posed simple questions in geometry to children from varied backgrounds. One group consisted of 7-to-13-year-old children of the Mundurucu, an isolated indigenous group in the Amazon basin. The Mundurucu children, who had no formal training in geometry, answered the questions just as quickly and accurately as did French children of the same ages who did have formal training in geometry. In contrast, 5-year-old North American children had much more trouble answering the questions. The researchers concluded that some basin geometric knowledge is innate, but this innate knowledge typically develops only after age 5.

In the table, select the statement that would, if true, most strengthen the researchers' conclusion and most weaken it, respectively. Make only two selections, one in each column.

Most weaken	Most strengthen
		North American children 7 to 13 years old had much more trouble answering the questions than did the Mundurucu of the same ages
		None of the 5-year-old north American children had ever studied any geometry
		Mundurucu children who were 5 years old had just as much trouble answering the questions as did the 5-year-old north American children
		The researchers posed the same questions to 5-year-old French and Mundurucu as they posed to the 7-to-13-year-old children
		Most of the children studied answered one or more of the questions incorrectly

440人做过此题 平均耗时为5min11s 平均正确率为 67%

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5

A mattress company has two stores, one in City X and the other in City Z. The company has advertised equally in newspapers in both cities, but has advertised twice as much on the radio in City Z as in City X. The two cities have similar populations and economies and the sales at each store have been roughly equal. A consultant claims this shows that the radio advertising has not improved mattress sales.

In the table, select changes that the company could make in City X and City Z, respectively, that together would probably be most helpful in testing the consultant's claim. Make only two selections, one in each column.

CITY Y	CITY X
		Double newspaper advertising
		Eliminate newspaper advertising
		Eliminate radio advertising
		Change the content of radio advertising
		Add television advertising

209人做过此题 平均耗时为3min10s 平均正确率为 41%

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