There are many rivers in my hometown. In the old d - 学进去中小学试卷试题库

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所属科目：小学英语

There are many rivers in my hometown. In the old days, they _______ clean and there were many kinds of _______ in the rivers. But now they _______ dirty and we can’t swim there. Because some _______ put the trash into the river. It _______ the water dirty. We can’t drink the water there. Let’s do our best to make the rivers clean.

1．

A．are

B．weren’t

C．were

2．

A．fishes

B．water

C．smoke

3．

A．were

B．are

C．is

4．

A．people

B．peoples

C．man

5．

A．make

B．makes

C．help

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有奖纠错

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优质答疑

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

用户名称

2019-09-19

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