单选题 1分

Depths in the routes (Malacca and Singapore Straits) vary between 20 m and about 23 m but there are ...

Depths in the routes (Malacca and Singapore Straits) vary between 20 m and about 23 m but there are many areas of sandwaves and depths are liable to change. The statement infers that ______.
  • A.depths in Malacca and Singapore Straits are stable
  • B.depths in Malacca and Singapore Straits are changeable
  • C.depths in Malacca and Singapore Straits are invariable
  • D.depths in Malacca and Singapore Straits are the same all the time

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