Test # 66
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1450 questions in 145 tests. Each test contains 10 questions.
Idiom of the Day
tit for tat
equal treatment in return for something, a fair exchange
The government policy was tit for tat to any attacks against its territory.
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The third main type of lift used by glider pilots is the lee waves that occur near mountains. The obstruction to the airflow can generate standing waves with alternating areas of lift and sink. The top of each wave peak is often marked by lenticular cloud formations.