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今年受新冠（COVID-19）疫情影响，我市中小学开展了线上教学。假如你是李华，你的美国网友Eric即将进行线上学习，他发来邮件向你了解相关情况。请你结合自身经历和以下提示，向Eric回复邮件，介绍线上学习的利弊，并针对线上学习的不足，提出至少一条建议。
Online Learning | |
Advantages | 1.convenient 2. different resources(资源)3. … |
Disadvantages | 1.influence eyesight 2. easily distracted(分心)3. ... |
要求：
1.语句通顺，意思连贯，语法正确，书写规范；
2.必须包含所给提示，并做适当发挥；
3.文中不得出现真实人名、校名或地名；
4.词数：100词左右(开头和结尾已给出，不计入总词数)。
Dear Eric,
I’m so glad to hear from you.______________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________
I hope this will be helpful to you. I’m looking forward to your reply.
Yours,
Li Hua
同类型试题
y = sin x， x∈R， y∈[–1，1]，周期为2π，函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x， x∈[–1，1]， y∈[–π/2，π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2
y = sin x， x∈R， y∈[–1，1]，周期为2π，函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x， x∈[–1，1]， y∈[–π/2，π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2
