Today’s homework is too__________ . It’s the __________ homework I’ve done this term.
A. simple; simpler
B. simple; simple
C. simpler; simplest
D. simple; simplest
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You will be late unless you ________ at once.
A. go
B. will go
C. are going
D. went
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
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