文法測驗

A mobile may look simple as it shifts in the wind,…

 (A) a fold of skin that closes over the eye, protecting it from damage.

 (B) but the interior of the hole remained cooler than the sweltering outside.

 (C) hard enough to protect their noses from windblown sand and desert.

 (D) so there could be no secret signal between owner and the horse.

 (E) when a lack of food chemicals is detected in the blood.

 (F) which has been trained to hunt for the royalty of Europe and Africa for centuries.

 (G) but it requires careful construction to work properly.

 (H) legend has it that the single bird lived for exactly five hundred years.

 (I) such as caves several miles beneath the surface.

 (J) since firefighters’ best efforts may be dwarfed by the fury of a large fire.