Activity 16: No.2

117 Using the figure in the Special window, Activity "L" has an early start time of _____ weeks and an early finish time of _____ weeks.

A. 11, 13

B. 12, 14

C. 13, 15

D. 14, 16

E. 15, 17

199 Using the figure in the Special window, Activity "L" has an early start time of _____ weeks and an early finish time of _____ weeks.

A. 11, 13

B. 12, 14

C. 13, 15

D. 14, 16

E. 15, 17

s and an early finish time of _____ weeks.

A . 11, 13

B . 12, 14

C . 13, 15

D . 14, 16

E . 15, 17

actually you cannot. The good news,【B1】______, is that while such memories may be currently【B2】______, they are not entirely gone, and could theoretically be【B3】______, according to a new brain research. In the study, biologist Jeffrey Johnson【B4】______16 college participants through an FMRI machine (which【B5】______nervous activity via blood flow)to compare brain patterns【B6】______memory formation and recall. First, he showed the students various common words and had them【B7】______a few tasks: say the word backwards in your head,【B8】______its uses, and picture how an artist would【B9】______it. Then, 20 minutes later, after the students re-entered the FMRI machine, Johnson showed them the list of words and asked them to recall【B10】______they could from before. Finally, he compared brain activity from both【B11】______and what he found will surprise you. Using【B12】______is called "pattern analysis" , its possible to【B13】______a unique pattern of brain activity to every individual thing we do. This means that when a participant says the word "apple" backwards the【B14】______pattern of brain activity is different from when he pictures the fruit.【B15】______interestingly, there is close similarity between the pattern that emerges when we【B16】______an activity and when we later recall it. The stronger our memory, the【B17】______the pattern, but as Johnson found, even at a moment【B18】______we cannot remember anything, our nerve cells still fire in a way that【B19】______the activity of when we formed the memory. This【B20】______that sometime in the future we may be able to retrieve the memories we thought wed lost forever.

【B1】

A．although

B．rather

C．though

D．therefore

Formal economic forecasting is usually based on a (1)_____ theory as to how the economy works. Some theories are complicated, and their application requires an elaborate (2)_____ of cause and effect. Others are relatively simple, (3)_____ most developments in the economy to one or two basic factors. Many economists, for example, believe that changes in the supply of money (4)_____ the rate of growth of general business activity. Others (5)_____ a central role to investment in new facilities—housing, industrial plants, highways, and so forth. In the United States, where consumers (6)_____ such a large share of economic activity, some economy believe that consumer decisions to (7)_____ or save provide the principal (8)_____ to the future course of the entire economy. Obviously the theory that a forecaster applies is of (9)_____ importance to the forecasting process; it (10)_____ his line of investigation, the statistics he will regard as most important, and many of the techniques he will apply.

Although economic theory may determine the general (11)_____ of a forecast, judgment also often plays an important role. A forecaster may decide that the circumstances of the moment are (12)_____ and that a forecast produced by the (13)_____ statistical methods should be modified to take account of special current circumstances. This is particularly necessary when some event outside the Usual run of economic activity has an a (14)_____ economic effect. For example, forecasts of 1987 economic activity in the United States were more accurate when the analyst correctly foresaw that the exchange value of the dollar would (15)_____ sharply during the year that consumer spending would slacken, and that (16)_____ rates would rise only moderately. None of these conclusions followed (17)_____ purely economic analysis; they all required judgment as to future decisions (18)_____, an economist may decide to adjust an economic forecast that was made by traditional methods to take account of other unique (19)_____; he may, for example, decide that consumers will (20)_____ their spending patterns because of special circumstances such as rising price of imports or fear of threatened shortages.

A．specific

B．peculiar

C．unique

D．unified