题目内容

苯a,呋喃b,吡咯c,噻吩d发生亲电取代反应的活性次序是()。

A. a>b>c>d
B. b>a>c>d
C. d>c>b>a
D. c>b>d>a

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能与马来酐发生Diels-Alder反应的是()。

A. 呋喃
B. 噻吩
C. 苯
D. 吡啶

Erythrocyte is the scientific name for a:

A. white blood cell
B. lymphocyte
C. red blood cell
D. muscle cell

Platelets, or thrombocytes, are involved in:

A. inflammation
B. digestion
C. immunity
D. blood clotting

The white blood cells active in immunity are the:

A. hematids
B. lymphocytes
C. adipose cells
D. chondrocytes

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