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【单选题】
下列结构中为棘皮动物特有的是 ____。A.
围脏腔
B.
围心腔
C.
水管系统
D.
水沟系统
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反馈参考答案：
举一反三
【单选题】Kenya is cited as an example to show that
A.
poor countries' economy will continue to prosper.
B.
poor countries should not rely only on agriculture.
C.
poor countries should fight to reduce trade tariffs.
D.
poor countries should be given fair treatment.
【单选题】如图所示，边长为2a的正方形薄板，剪掉四分之一后用细绳悬挂在A点，预使上边BD保持水平状态，求悬挂点与B端距离x的值。 【图片】
A.
3a/4
B.
4a /5
C.
5a /6
D.
6a /7
【单选题】In the author's opinion, what is most important in shaping a generation?
A.
Peace and prosperity.
B.
Unfavorable conditions.
C.
A world without megachanges.
D.
the baby boom.
【单选题】The environment is exactly everything that affect us in some_____.
A.
aspect
B.
aspects
C.
suspect
D.
prospect
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