boldface题中consideration怎么看出来，inference和conclusion有什么不同

petrel杜

今天看了论坛上关于boldface题的好多讨论，更加困惑了。
问题一:consideration有什么标志词么？
Plant scientists have used genetic engineering on seeds to produce crop plants that are highly resistant to insect damage. Unfortunately, the seeds themselves are quite expensive, and the plants require more fertilizer and water to grow well than normal ones. Thus, for most farmers the savings on pesticides would not compensate for the higher seed costs and the cost of additional fertilizer. However, since consumer demand for grains, fruits, and vegetables grown without the use of pesticides continues to rise, the use of genetically engineered seeds of this kind is likely to become widespread.

In the argument given, the two portions in boldface play which of the following roles?

(A) The first supplies a context for the argument; the second is the argument's main conclusion.
(B) The first introduces a development that the argument predicts will have a certain outcome; the second is a state of affairs that the argument denies will be part of that outcome.
(C) The first presents a development that the argument predicts will have a certain outcome; the second acknowledges a consideration that weighs against that prediction.
(D) The first provides evidence to support a prediction that the argument seeks to defend; the second is that prediction.
(E) The first and the second each provide evidence to support the argument's main conclusion.

这题里说正确选项的consideration还能理解，请看下面一道题的consideration我就完全不能理解了...

1. Modern navigation systems, which are found in most of today's commercial aircraft, are made with low-power circuitry, which is more susceptible to interference than the vacuum-tube circuitry found in older planes. During landing, navigation systems receive radio signals from the airport to guide the plane to the runway.
Recently, one plane with low-power circuitry veered off course during landing, its dials dimming, when a passenger turned on a laptop computer. Clearly, modern aircraft navigation systems are being put at risk by the electronic devices that passengers carry on board, such as cassette players and laptop computers.

The two portions in boldface play which of the following roles?

(A) The first is a principle that the argument relies on and the second is a conclusion that can be drawn from the first.
(B) The first is a fact that argument relies on and the second is a conclusion that must be drawn from this argument.
(C) The first acknowledges a consideration that supports that main position; the second is that conclusion.
(D) The first is an evidence that supports the conclusion, the second is that conclusion.
(E) The first is a principle that is necessary for this argument, the second is a conclusion that could be drawn from this argument.

我觉得应该选B

问题二：infenrence和conclusion有什么不同？是不是有could be 或者 would be 的都是 inference, 有 must 什么的都是conclusion？

问题三:factor 和evidence哪个包含哪个？有什么标志么?

另附几道问题，望NN给出解析
More and more computer programs that provide solutions to mathematical problems in engineering are being produced, and it is thus increasingly unnecessary for practicing engineers to have a thorough understanding of fundamental mathematical principles.Consequently, in training engineers who will work in industry, less emphasis should be placed on mathematical principles, so that space in the engineering curriculum will be available for other important subjects.

The two portions in boldface play which of the following roles?

(A) The first is the second-premise that the argument includes; the second is the conclusion that could be drawn from this passage.
(B) The first is the fact that is necessary for this argument; the second is the conclusion that must be drawn from this passage.
(C) The first is the part of premise that the argument includes; the second is the inference that could be drawn from this passage.
(D) The first is the part of evidence that supports this argument; the second is the inference that could be drawn from this passage.
(E) The first is the first conclusion in this argument; the second is the second conclusion in this argument.

这题我看还有选E的，甚为困惑。。。

petrel杜

哦，对了，还想问大家一下。这类题型真的是不用理解意思么，我觉得有的时候长篇的话还是得明白讲的什么的。望解答！

DUKB24

怎么可能不用理解意思...BF题要了解全文的结构...active reading...注意转折词和时态代表可能性（就是will可能表示prediction）..BF题是其实说白就是阅读题...仔细方能做对

petrel杜

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