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We visited the beach yesterday. It was sunny. We went swimming in the sea. We felt cool in the water. The beach was quite dirty. There were plastic bags, cans, lunch boxes, leaves and a lot of broken bottles. The pollution(污染)on the beach is very serious(严重的). I think people must put rubbish in the bin. We should protect the beach. Do you think so?
1．We went to the beach on a rainy day.2．I swam in the sea.
3．I saw some rubbish on the beach.
4．The beach was very clean.
5．We should protect the beach.
同类型试题
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
