AI explanationShows the answer. Tap to open.
Correct Answer: C
Why this is correct: adoption means 'starting to use something'. 'Widespread adoption of self-driving vehicles' means lots of people begin using them, which fits the idea of preventing accidents.
Tips: Memory trick: to adopt a habit is to start doing it. Adoption of cars means people start using them.
Why the other options are wrong:
- A: acceptance means 'agreeing that something is good'. This is a Thematic Trap - people might accept the idea without actually using the cars.
- B: approval means 'official permission or agreement'. This is a Thematic Trap - it is about saying yes, not about people actually driving the cars.
Key Vocabulary:
- adoption = starting to use something
- approval = official permission
Correct Answer: A
Why this is correct: countless means 'too many to count'. 'Save countless lives' is a very common pairing and fits the huge number of lives that could be saved.
Tips: Memory trick: count-LESS means you cannot count them - there are just too many. 'Countless lives' is the natural phrase.
Why the other options are wrong:
- B: limitless means 'with no limit', and it usually describes energy or space, not lives. 'Limitless lives' sounds odd.
- C: endless means 'never ending in length or time'. 'Endless lives' does not fit, because lives are counted, not measured in length.
Key Vocabulary:
- countless = too many to count
- collocation: save countless lives
Correct Answer: B
Why this is correct: consistent means 'staying the same' or 'steady'. 'Maintaining consistent speeds' means keeping speeds even, which leads to smoother traffic.
Tips: Memory trick: consistent = con-STAY-stent. It stays the same. Steady speeds are consistent speeds.
Why the other options are wrong:
- A: expected means 'predicted'. It could describe a speed you guess in advance, but it does not mean steady, so it misses the point.
- C: dependable means 'reliable', and it usually describes people or machines you can trust, not speeds. 'Dependable speeds' sounds odd.
Key Vocabulary:
- consistent = steady = staying the same
- dependable = reliable, can be trusted
Correct Answer: A
Why this is correct: fatally is an adverb meaning 'in a way that causes death'. It describes the verb 'struck', so 'fatally struck' means hit in a way that killed the pedestrian.
Tips: Memory trick: words ending in '-ly' like 'fatally' describe actions. To describe the verb 'struck', you need the '-ly' form.
Why the other options are wrong:
- B: deadly is an adjective, not an adverb, so it cannot describe the verb 'struck'. This is a Structural Trap - the word class is wrong.
- C: incurably means 'in a way that cannot be cured', which is about illness. It does not fit being struck by a car.
Key Vocabulary:
- fatally = in a way that causes death (adverb)
- deadly = causing death (adjective)
Correct Answer: C
Why this is correct: reliability means 'being able to be trusted to work safely and well'. 'Ensure the reliability of driverless vehicles' means making sure they can be trusted, which matches the talk of safety.
Tips: Memory trick: a reliable friend never lets you down. Reliability in cars means they always work safely.
Why the other options are wrong:
- A: certainty means 'being sure or definite'. 'Certainty of vehicles' does not make sense, so the meaning does not fit.
- B: honesty means 'telling the truth'. This describes people, not vehicles, so it does not work here.
Key Vocabulary:
- reliability = can be trusted to work well
- reliable = dependable = trustworthy
The rest of this explanation is for members. Sign in free to read why the other options are wrong, key words and tips.
Sign in to read the full explanation