题目内容

You will be late unless you ________ at once.

A. go
B. will go
C. are going
D. went

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It was last Sunday morning. It rained .

A. rainy; heavy
B. rainy; heavily
C. raining; heavy
D. rain; heavily

I’ll go with you the moment I ________ my work.

A. will finish
B. finish
C. am finishing
D. finished

在生理条件下合成血红素的限速步骤是合成

A. 胆色素原
B. 原卟啉Ⅸ
C. 尿卟啉原Ⅲ
D. 粪卟啉原
E. d-氨基Y-酮戊酸

2，3-二磷酸甘油酸(DPG)可使

A. Hb与CO2结合
B. Hb在肺中易将O2放出
C. Hb在组织中易与O2结合
D. Hb在肺中易与O2结合
E. Hb在组织中易将O2放出