题目:
In laboratory rats, a low dose of aspirin usually suffices to block production of thromboxane, which is a substance that promotes blood clotting, but not seriously interfering with the production of prostacyclin, which prevents clotting.
选项:
A、 which is a substance that promotes blood clotting, but not seriously interfering
B、 a substance that promotes blood clotting, but not seriously interfering
C、 a substance that promotes blood clotting, but does not seriously interfere
D、 which is a substance to promote blood clotting, but does not seriously interfere
E、 which is a substance that promotes blood clotting, but not a serious interference
答案:
C