2. 外语
  3. Bursae are fluid-filled sacs that (form) cushions (between) tendons and bones (and) protect them (while) movement.

Bursae are fluid-filled sacs that (form) cushions (between) tendons and bones (and) protect them (while) movement.

admin2005-01-30  27
问题 Bursae are fluid-filled sacs that (form) cushions (between) tendons and bones (and) protect them (while) movement.
选项 A、form
B、between
C、and
D、while
答案D
解析
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