[填空题]Note: When more than one answer is required, these may be given in any order. Some choices may be required more than once.
A=Saturn B=Venus C=Mercury
Which planets ...
· has been explored by 15 spacecraft 21. ______
· has a system of rings and more than I satellites 22. ______
· has a weak magnetic field 23. ______
· has the lowest density 24. ______
· is named after the Roman goddess of beauty 25. ______
· was believed to have a sinister influence upon people 26. ______
· was thought by ancient people as two separate stars 27. ______
· is completely covered with opaque clouds 28. ______
· are closer to the Sun than the Earth 29. ______
30.

[填空题]Note: When more than one answer is required, these may be given in any order. Some choices may be required more than once.
A=KA Superba B=KD Continental C=MTB2456
Which refrigerator ...
· is old fashioned in style but designed with many doors to save energy 21. ______
· is top-mounted and cheaper than the other two kinds of refrigerators 22. ______
· is of a side-by-side model with convenient features for all the family members 23. ______
· consumes the most amount of energy annually 24. ______
· offers a convenient paddle to switch off its ice-and-water dispenser 25. ______
· has one full-year quality guarantee with another five years limited warranty 26. ______
· has little noise when it is in operation 27. ______