单项选择题


Questions 23-26

A． Two important tests of a new airliner before it is put into use.
B． How to carry out tank test in the water.
C． How pilots carry out the test flight.
D． How to make a safe passenger plane.
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单项选择题
A． Capitol Hill--the Washington Monument--the White House.B． The Capitol Building--the National Gallery--the Washington Monument.C． The Washington Monument--the Mall--the Air ＆ Space Museum.D． The Washington Monument--Capitol Hill--the White House.
A． Capitol Hill--the Washington Monument--the White House.
B． The Capitol Building--the National Gallery--the Washington Monument.
C． The Washington Monument--the Mall--the Air ＆ Space Museum.
D． The Washington Monument--Capitol Hill--the White House.
单项选择题
A． They are found under the oceans.B． They were most active when Earth was first formed.C． Their emissions created the Earth’s atmosphere.D． Their fumes are mostly water.
A． They are found under the oceans.
B． They were most active when Earth was first formed.
C． Their emissions created the Earth’s atmosphere.
D． Their fumes are mostly water.
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