单选题 If a child is left alone, he'll lose his zest for life and his desire to find out new things for himself.
【正确答案】
【答案解析】[词义辨析] zest与interest同义，意为“热情，兴奋，兴趣。”courage“勇气，胆量”；direction“方向，趋向，趋势”；confidence“把握，自信心”。