学进去-教育应平等而普惠
试题
类型:阅读单选
难度系数:0.15
所属科目:初中英语

Earth is getting more crowded as the world population is still growing. Especially in some countries, their population growth is faster than others. These include Egypt, India, Nigeria and so on. However, the growth may not last always. The low birth rate (出生率) and more older people will be the main causes.

According to the World Population Prospects 2022, the world population should reach 8 billion on November 15 this year. It could grow to 9.7 billion in 2050, before reaching the highest point of around 10.4 billion people during the 2080. The population is expected (预期) to stay at that level until 2100. And in 2023, India should overtake China and have the largest population in the world.

While the world population is still growing, its growth rate is at its slowest since 1950 because of fewer babies. Today, two-thirds of the world population live in a country or area where lifetime fertility (生育率) is below 2.1 births for each woman. A population with this kind of birth rate and low death rate would not grow or reduce over time. It would stay about the same.

A low birth rate means fewer young people to care for the growing aging population worldwide. The share of the world population aged 65 or above is expected to rise to 16 percent in 2050. Around the world, life expectancy (预期寿命) could go up to 77.2 years in 2050 from 72.8 years in 2019. However, where you’re born can decide your life expectancy. Life expectancy for the least developed countries is 7 years less than the world average (平均).

1.Which country is expected to have the largest population in 2023?
A.India.B.China.C.Egypt.D.Nigeria.
2.According to Paragraph 2, which of the following pictures can show the change of the population?
A.B.
C.D.
3.The growth rate of the world population has something to do with ________.
①birth rate ②death rate ③the number of countries ④lifetime fertility
A.①②③B.①②④C.②③④D.①③④
4.In 2050, life expectancy for the least developed countries may be ________ years.
A.65B.70.2C.72.8D.77.2
5.What is the best structure(结构) for the text?
A.B.C.D.
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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

用户名称
2019-09-19

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

用户名称
2019-09-19
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