单项选择题

A．In warm air.
B．In cold air.
C．When it reaches the polar region.
D．Only when the clouds are down low.
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单项选择题
When the author was invited by Mrs. Brown to go on a picnic, she accepted it happily.
A．Y
B．N
C．NG
单项选择题
A．She’’ll have some chocolate cake.B．She’’ll take a look at the menu.C．She’’ll go without dessert.D．She’’ll prepare the dinner.
A．She’’ll have some chocolate cake.
B．She’’ll take a look at the menu.
C．She’’ll go without dessert.
D．She’’ll prepare the dinner.
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