Instructions

In the following passage, some words have been deleted. Fill in the blanks with the help of the alternatives given. Select the most appropriate option for each blank.

Data 1. _______ the Pioneer spacecraft of NASA apparently prove the theory that the high surface temperature of Venus is 2. _______ to an atmospheric greenhouse effect caused mainly by a blanket of carbon dioxide. Such a greenhouse 3. _______ is created when energy in the form of sunlight easily passes through a planet's atmosphere, warms its 4. _______ and is converted to heat radiation that is then held in by the atmosphere from top to bottom. Venus has a relatively thin atmosphere like the Earth's, but Venus' atmosphere consists of more than ninety percent carbon dioxide, compared to less than four percent in that of the 5. _______.

Question 25

Select the most appropriate option to fill in blank number 5.


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