A:the public have know
B:were the public know
C:have the public know
D:the public knew
物质
醋酸
橘子汁
草木灰水
炉具清洁剂
pH
2.5
3.4
11.1
12.4
补全下面的短文。
It was____yesterday.Bob got up early.He____English in the garden.After breakfast,he washed his clothes.In the afternoon,he____his aunt pick apples on the farm.In the evening,he____to work on the Internet but the computer didn't work.So he____it.What a busy day!
下图为自然界碳、水物质循环示意图。读图回答题。