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Alen is a new student in our class. He’s twelve years old. He has a twin brother. His name is Alex. They look like each other. Alen is 5 minutes younger than Alex. Alex is 165 centimetres. Alen is 167 centimetres. Alex is 50 kilo-grams. And Alen is 52 kilograms. They are in the same school, but not in the same class. They always go to school and go home together.
1．判断句子正(T)误(F)。(1) Alex and Alen are twins.
(2) Alen is older than Alex.
(3) Alex is taller and heavier than Alen.
(4) Alex and Alen are in different classes.
(5) Alex and Alen never go home together.
2．根据短文内容，补全信息。
 Name: Age: Height: Weight: |  Name: Alen Age: Height: Weight: |
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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
