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40岁，月经周期7～10d/20～40d，量多，基础体温单相，宫颈粘液结晶呈现持续雌激素高度影响，此时子宫内膜的改变为

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第二节完型填空
阅读下面短文，从短文后所给的[A]、[B]、[C]三个选项中选择能填入相应空白处的最佳选项。
In some countries, there is very【16】rain at any time. The farmers there【17】irrigate (灌溉) their fields. Irrigation is【18】if there is a big river【19】the crops, and【20】there is plenty of water in it. Canals (沟渠)【21】the river water to the fields when necessary. In some seasons【22】may be too much water in the river, and the【23】may flood all the land near the river.【24】other times the river water may not be enough for all the farmers, and then it will be【25】to irrigate the fields.
(16)

A. little
B. a little
C. few

排卵时关键性的激素为

are applicable to any type of commodity, without the restriction of hazardous consignment size.

A. Specific Commodity Rates
B. Class Rates
C. Bulk Unitization Rates
D. General Cargo Rates

由一些对某种危险有同一保障要求的人组成的一个集团,当其中某个成员受到灾害损失时,由其余成员共同来分担,即由各社员分摊用于支付损失赔偿的保险金。这种保险是()。

A. 相互保险
B. 共同保险
C. 合作保险
D. 社会保险