When something is on fire. People throw sand (沙子) on it to put out the fire. The
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When something is on fire. People throw sand (沙子) on it to put out the fire. The main use of the sand is to ________. |
[ ] |
A. protect the thing on fire. B. add weight to the thing on fire. C. keep the air away from the thing on fire. D. lower the temperature of the thing on fire. |
答案
C |
举一反三
—People can not only use salt for meals. —Yes. They also use it to _______ fire. |
[ ] |
A. put on B. put off C. put out D. put down |
The trees can prevent the rain _______ the ground directly. |
[ ] |
A. from hitting B. to hit C. hit D. hiting |
Now more and more man-made satellites are _______ by humans. |
[ ] |
A. sent for B. send up C. sent up D. sent into |
—Will you go for a picnic with your parents this weekend? —It just ______ the weather. |
[ ] |
A. because of B. decides by C. depends on D. thanks to |
The report shows we have dreamed _______ exploring space for thousands of years. |
[ ] |
A. in B. on C. of D. to |
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