如图为了使物体A往左边运动，现用滑轮组来达到目的，请画出最省力的绕法．
It's a sunny day. There _______ many people here on vacation.[ ]
A. be
B. was
C. is
D. are
溶血反应的早期表现是（）。
A.腰背剧痛，心前区压迫感
B.局部潮红，荨麻疹
C.休克、黄疸
D.血红蛋白尿
E.皮肤出血点和淤斑
