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【单选题】
给贮藏粮食的仓库中充入二氧化碳可以延长粮食贮藏的时间，这是因为A.
二氧化碳浓度高，增强了呼吸作用
B.
二氧化碳浓度高，抑制了呼吸作用
C.
二氧化碳浓度高，增强了光合作用
D.
二氧化碳浓度高，抑制了光合作用
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皮皮学刷刷变学霸
举一反三
【单选题】1964年世界医学大会颁布、又经过多次修订的关于医学实验的医学伦理文件是
A.
《赫尔辛基宣言》
B.
《悉尼宣言》
C.
《日内瓦协议法》
D.
《纽伦堡法典》
E.
《阿拉木图宣言》
【单选题】1964年世界医学大会颁布、又经过多次修订的关于医学实验的医学伦理文件是（ ）
A.
《赫尔辛基宣言》
B.
《悉尼宣言》
C.
《日内瓦协议法》
D.
《阿拉木图宣言》
【单选题】—Why didn’t you come to the meeting yesterday? —I_________,but my old father came unexpectedly.
A.
had to
B.
was going to
C.
want to
D.
ought to
【简答题】听对话,回答问题。 1. Why didn't Bob go fishing on his day off? A. It rained. B. His father didn't agree. C. He didn't feel well. 2. What did Bob do at last? A. Stayed at home and studied. B. Saw the dolphin s...
【单选题】Why didn’t Linda’s father want her to study in the United States?
A.
Because he didn’t like the United States
B.
Because he didn’t want Linda, his only child, to leave China.
C.
Because he couldn’t accept the American culture.
D.
Because he didn’t think the United States is a safe country for a young girl.
【单选题】-Why didn't you turn up at the meeting? -I ________ for a longdistance call from my father in England. [ ]
A.
waited
B.
had waited
C.
was waiting
D.
have been waiting
【单选题】Why didn't the king believe the old man's story? Because ______.
A.
his father never told him anything about a jar of gold
B.
there wasn't enough gold to fill the jar with in his country
C.
he didn't want to return the old man the jar of gold
【单选题】墨子曰: “百工为方以矩,为圆以规,直以绳,正以悬, 「平以水」, 无巧工,不巧工,皆以此五者为法。”所以,“天下从事者,不可以无法仪,无法仪而其事能成者,无有也。” 墨子用的推理是:
A.
科学归纳法
B.
简单枚举法
C.
完全归纳法
D.
演绎推理法
【单选题】The reason _____ Malcolm didn't study art was _____ his father didn't want him to. [ ]
A.
for; because
B.
why; because
C.
why; that
D.
of; which
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