Cảnh báo với bút tàng hình
Gần đây, một người bạn là giáo viên đang dạy cấp 1 than thở với tôi: "Càng ngày học sinh càng sử dụng nhiều chiêu thức "ảo thuật" khi làm bài thi". Hỏi ra mới biết, dù đang là học sinh lớp 4, nhưng trong giờ thi học kỳ, có em đã sử dụng bút tàng hình để chép tài liệu.
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