题目内容

分娩即将开始的较可靠的征象是( )

A. 阴道流出血性粘液
B. 子宫底降低
C. 胎动活跃
D. 尿中绒毛膜促性腺激素增高
E. 先露已入盆

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每题填大写字母序号即可（A.B.C.D.）Choose the one which can fully express the meaning of the words given below:1.…gray clouds scudded in from the Gulf on the rising wind.A. go smoothlyB. go straight and fastC. go up and down D. go violently2.One wall began crumbling on the marooned group.A. stay brave and alongB. leave hopefulC. stay helpless D. leave helpless and alone3.…and 709 small businesses were demolished or severely damaged.A. destroyB. reduceC. increaseD. beat4.Debris flew as the living-room fireplace and its chimney collapsed.A. small individual partsB. completely good placesC. well preserved piecesD. scattered broken pieces5.We can prop it up with our heads and shoulders!A. supportB. placeC. suspendD. propose

环是指一条边的两个端点相同。

A. 对
B. 错

连通图是指网络图中任意两点之间至少有一条通路将它们连接起来。

A. 对
B. 错

在点集合相同的所有图中，树是含边数最少的连通图。

A. 对
B. 错