1选择题
Look at the picture. The ruler is _______ long.
- A. 15 centimeters
- B. 15 meters
- C. 15 kilometers
- D. 15 tons
答案：A
解析：本题考查长度单位的选择。图片通常显示一把尺子，其长度用厘米（centimeters）最合适。米（meters）和千米（kilometers）太大，吨（tons）是重量单位。易错点：混淆长度单位和重量单位。
2选择题
— What time is it now? — It's _______.
- A. three o'clock in the afternoon
- B. fifteen o'clock
- C. 3:00 p.m.
- D. 15:00 a.m.
答案：C
解析：本题考查时间表达。在英语中，下午3点可以表达为“3:00 p.m.”。选项A是口语化表达，但不如C选项简洁规范。选项B和D是错误的表达方式。易错点：混淆a.m.和p.m.的使用，或误用24时制表达。
3选择题
My brother is 8 years old. I am twice his age. How old am I?
答案：C
解析：本题考查“倍的认识”。twice his age 意思是“他的年龄的两倍”，即8×2=16岁。易错点：将“twice”误解为“一半”或“增加”。
4选择题
There are 24 apples in the box. We want to share them equally among 4 children. How many apples does each child get?
答案：B
解析：本题考查除法运算。24 ÷ 4 = 6。易错点：计算错误或混淆乘除法。
5填空题
The length of this pencil is 12 _______ (毫米).
答案：millimeters
解析：本题考查长度单位“毫米”的英文拼写。毫米是millimeter，复数形式为millimeters。易错点：拼写错误或忘记加复数s。
6填空题
A square has four sides of equal length. If one side is 5 cm, its perimeter is _______ cm.
答案：20
解析：本题考查正方形周长计算。正方形周长 = 边长 × 4，即5 × 4 = 20厘米。易错点：误用长方形周长公式或计算错误。
7解答题
Sarah has 35 stickers. Her friend Lucy has 18 stickers. How many stickers do they have in total?
答案：They have 53 stickers in total. (35 + 18 = 53)
解析：本题考查万以内的加法。计算时注意进位：35 + 18，个位5+8=13，写3进1；十位3+1+1=5。易错点：忘记进位或计算错误。
8解答题
A rectangular garden is 8 meters long and 3 meters wide. What is the perimeter of the garden?
答案：The perimeter is 22 meters. (Perimeter = (8 + 3) × 2 = 11 × 2 = 22 meters)
解析：本题考查长方形周长计算。长方形周长 = (长 + 宽) × 2。易错点：误将长和宽直接相加而不乘以2，或计算错误。