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【单选题】
Which of these amino acids are achiral?A.
CH 3 CH(NH 2 )COOH
B.
CH 2 (NH 2 )COOH
C.
CH 2 (OH)CH(NH 2 )COOH
D.
CH 3 CH 2 CH(NH 2 )COOH
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举一反三
【单选题】Which of the following is NOT mentioned in the passage as the reason for babies' cry?
A.
Discomfort.
B.
Hungry.
C.
Consolation.
D.
Thirsty.
【单选题】Babies usually cry when they feel _______because they have no other way to express themselves.
A.
distinguished
B.
distressed
C.
discouraged
D.
dishonest
【单选题】Babies usually cry when they feel ____ because they have no other way to express themselves.
A.
distinguished
B.
dishonest
C.
distressed
D.
discouraged
【单选题】关于腹部动脉,说法错误的是________。
A.
腹主动脉是腹腔动脉的主干，有下腔静脉与之伴行，其分支有脏支和壁支。
B.
腹主动脉的脏支有成对和不成对之分，成对的有肾上腺中动脉、肾动脉、睾丸/卵巢动脉，不成对的有腹腔干、肠系膜上动脉、肠系膜下动脉。
C.
腹腔干的分支有肝总动脉、胃左动脉、脾动脉，胃的全部血供均来自于胃左动脉。
D.
阑尾动脉由肠系膜上动脉的分支回结肠动脉发出。
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