单项选择题

W: What can I do for you
M: I want to buy some stamps. How much is a stamp
W: Twenty cents.
M: I also want some envelopes.
W: How many do you want
M: Ten stamps and four envelopes.
W: Ten stamps and four envelopes. $ 2.20 in all. Anything else
M: No, thanks. Here is the money.
W: Here are your stamps and envelopes.
M: Thank you.
How much does it cost for five stamps().

A．20 cents.
B．$1.
C．$2.20.

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单项选择题

People feel cool when they are near a lake or an ocean because().

A．the earth cannot make the air over the earth hot
B．the earth is very hot
C．cool air from the water moves towards the land
D．the water is colder than the earth

单项选择题

According to the writer, we need to sleep().

A．to rest our bodies
B．to rest our arms and legs
C．to become less angry
D．both A and B