盐 日语:【the two scientists ___ the photos of mars forsigns of lifeA learn B study】

【the two scientists ___ the photos of mars forsigns of lifeA learn B study】 The scientists on the ground told the astronaunts The two-Day Weekerd the first two chindren both the two girls Leaders of the two neighboring...... Two reasons bring the difficulties: Can you tell me something about the great scientists of the 18th century? Can you tell me something about the great scientists of the 18t century? Can you tell me something about the great scientists of the 18t century?