Suppose Iran imposes a tariff on lumber. For the tariff to have any effect, it must be the case that（）
A. Iran is an exporter of lumber
B. the domestic quantity of lumber supplied exceeds the domestic quantity of lumber demanded at the world price without the tariff
C. the world price without the tariff is less than the price of lumber without trade
D. the world price without the tariff is greater than the price of lumber without trade
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Which of the underlined What- structures functions differently from the others（）
A. What gave it an air of intensity was that Daisy lived there
B. I have been impressed by what he presented
C. Would you please translate into Chinese what’s written on the blackboard
D. What do you know about the coming contest
The terminal voltage of all parallel components is of（）
A. the same voltage
B. the different voltage
C. the same current
D. the different current
Please choose the best answer for each incomplete sentence. The early achievements in space exploration were all crash-landings, each spacecraft___（）
A. having been destroying
B. in destroy
C. destroying
D. being destroyed
Please choose the best answer for each incomplete sentence.”Eric nearly always wins the science award.” “That’s because his projects are____.”（）
A. extremely presented well
B. well presented extremely
C. presented well extremely
D. extremely well presented
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