業精於勤，事立於豫

      Kids who live in northern U. S. states are used to having class canceled every now and then because of snow. But on Monday, a number of schools across the Northeast closed their doors __16__ a different reason: dangerously cold outdoor temperatures. Throughout the region, temperatures __17__ below zero. Schools canceled classes or delayed openings to protect students from the __18__ . The wind chill made it feel __19__ cold as 25 to 30 degrees below zero. The weathermen issued warnings about the __20__ of staying outside in the cold for too long. The cold was expected to last until Thursday.

文意分析：

Kids who live in northern U. S. states are used to having class canceled every now and then because of snow. (住在美國北部各州的孩子常習慣因積雪而取消上課。)

But on Monday, a number of schools across the Northeast closed their doors __16__ a different reason: dangerously cold outdoor temperatures. (

但在星期一，在東北部的許多學校停止上課則是為了不同原因：(因為)外面氣溫嚴寒。)

16. (A)in (B)for (C)at (D)on 

為了...原因，介係詞用 for。

for a diffenent reason 為了一個不同的原因。

Throughout the region, temperatures __17__ below zero. (整個地區，氣溫下滑到零度以下。)

17. (A)fell 跌落 (B)made 製造(C)raised 上升 (D)touched 觸碰

Schools canceled classes or delayed openings to protect students from the __18__ . (學校取消上課或延遲開學時間，以保護學生遠離寒冷。)

18. (A)cold 寒冷 (B)criminals 罪犯 (C)temperatures 溫度 (D)traffic 交通

* climate 氣候

The wind chill made it feel __19__ cold as 25 to 30 degrees below zero. (寒風讓天氣變得如同零下25度到30度以下一樣冷。)

19. (A)alike (B)as (C)like (D)to 

[考文法] A as adj./adv. as B (A和B一樣...)

The weathermen issued warnings about the __20__ of staying outside in the cold for too long. (氣象播報員發出長時間滯留在寒冷室外的危險警告。)

The cold was expected to last until Thursday. (這波寒流預計將持續到星期四。)

20. (A)benefit 利益 (B)danger 危險 (C)fun 有趣 (D)truth 真實